Call Now to Set Up Tutoring:

(888) 888-0446

Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

Create An Account

All Common Core: 2nd Grade Math Resources

7 Diagnostic Tests 217 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #303 : Operations

$\frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 9$

$\displaystyle 11$

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 10$

Correct answer:

$\displaystyle 12$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 14$ and count back $\displaystyle 2$.

$\displaystyle 14,13,12$

$\frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \space 12}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \space 12}$

Report an Error

Example Question #1878 : Common Core Math: Grade 2

$\frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 6$

$\displaystyle 8$

$\displaystyle 7$

$\displaystyle 9$

$\displaystyle 10$

Correct answer:

$\displaystyle 7$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 15$ and count back $\displaystyle 8$.

$\displaystyle 15, 14, 13, 12, 11, 10, 9, 8, 7$

$\frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space 7}$ $\displaystyle \frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space 7}$

Report an Error

Example Question #304 : Operations

$\frac{\begin{array}[b]{r}16\\ -\ 12\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 12\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 5$

$\displaystyle 4$

$\displaystyle 6$

$\displaystyle 2$

$\displaystyle 3$

Correct answer:

$\displaystyle 4$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 16$ and count back $\displaystyle 12$.

$\displaystyle 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4$

$\frac{\begin{array}[b]{r}16\\ -\ 12\end{array}}{ \ \ \ \ \ \space 4}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 12\end{array}}{ \ \ \ \ \ \space 4}$

Report an Error

Example Question #1880 : Common Core Math: Grade 2

$\frac{\begin{array}[b]{r}17\\ -\ 10\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ -\ 10\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 6$

$\displaystyle 9$

$\displaystyle 8$

$\displaystyle 7$

$\displaystyle 5$

Correct answer:

$\displaystyle 7$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 17$ and count back $\displaystyle 10$.

$\displaystyle 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7$

$\frac{\begin{array}[b]{r}17\\ -\ 10\end{array}}{ \ \ \ \ \ \space 7}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ -\ 10\end{array}}{ \ \ \ \ \ \space 7}$

Report an Error

Example Question #305 : Operations

$\frac{\begin{array}[b]{r}18\\ -\ 15\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 15\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 6$

$\displaystyle 7$

$\displaystyle 3$

$\displaystyle 4$

$\displaystyle 5$

Correct answer:

$\displaystyle 3$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 18$ and count back $\displaystyle 15$.

$\displaystyle 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3$

$\frac{\begin{array}[b]{r}18\\ -\ 15\end{array}}{ \ \ \ \ \ \space 3}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 15\end{array}}{ \ \ \ \ \ \space 3}$

Report an Error

Example Question #222 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 5$

$\displaystyle 6$

$\displaystyle 3$

$\displaystyle 7$

$\displaystyle 4$

Correct answer:

$\displaystyle 7$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 19$ and count back $\displaystyle 12$.

$\displaystyle 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7$

$\frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \ \ \space 7}$ $\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \ \ \space 7}$

Report an Error

Example Question #223 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}20\\ -\ 16\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 16\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 8$

$\displaystyle 7$

$\displaystyle 4$

$\displaystyle 6$

$\displaystyle 5$

Correct answer:

$\displaystyle 4$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 20$ and count back $\displaystyle 16$.

$\displaystyle 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4$

$\frac{\begin{array}[b]{r}20\\ -\ 16\end{array}}{ \ \ \ \ \ \space 4}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 16\end{array}}{ \ \ \ \ \ \space 4}$

Report an Error

Example Question #224 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}1\\ +\ 1\end{array}}{ \ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 1\end{array}}{ \ \ \ \space?}$

Possible Answers:

$\displaystyle 0$

$\displaystyle 2$

$\displaystyle 3$

$\displaystyle 4$

$\displaystyle 1$

Correct answer:

$\displaystyle 2$

Explanation:

To add we count up. Start at $\displaystyle 1$ and count up $\displaystyle 1$.

1,2 $\displaystyle 1,2$

$\frac{\begin{array}[b]{r}1\\ +\ 1\end{array}}{ \ \ \ \space2}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 1\end{array}}{ \ \ \ \space2}$

Report an Error

Example Question #225 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}14\\ +\ 1\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ +\ 1\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 16$

$\displaystyle 17$

$\displaystyle 15$

Correct answer:

$\displaystyle 15$

Explanation:

To add we count up. Start at $\displaystyle 14$ and count up $\displaystyle 1$.

14,15 $\displaystyle 14,15$

$\frac{\begin{array}[b]{r}14\\ +\ 1\end{array}}{ \ \ \space15}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ +\ 1\end{array}}{ \ \ \space15}$

Report an Error

Example Question #226 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}10\\ +\ 2\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 2\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 10$

$\displaystyle 9$

$\displaystyle 11$

Correct answer:

$\displaystyle 12$

Explanation:

To add we count up. Start at $\displaystyle 10$ and count up $\displaystyle 2$.

$\displaystyle 10,11,12$

$\frac{\begin{array}[b]{r}10\\ +\ 2\end{array}}{ \ \ \space12}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 2\end{array}}{ \ \ \space12}$

Report an Error

View Tutors

Marlene
Certified Tutor

Herbert Lehman, Bachelors, Recreation Education. Long Island University-Brooklyn Campus, Masters, Special Education.

View Tutors

Eric
Certified Tutor

Waynesburg University, Bachelor in Arts, Elementary Education.

View Tutors

Joshua
Certified Tutor

University of Cincinnati, Bachelor in Arts, English. Mount Saint Joesph University, Master of Arts, Teaching.

All Common Core: 2nd Grade Math Resources

7 Diagnostic Tests 217 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

GMAT Tutors in Chicago, GMAT Tutors in Los Angeles, GMAT Tutors in Denver, GMAT Tutors in San Francisco-Bay Area, Math Tutors in Miami, SAT Tutors in Washington DC, Spanish Tutors in Washington DC, GMAT Tutors in Miami, Spanish Tutors in Atlanta, SSAT Tutors in Phoenix

Popular Courses & Classes

ACT Courses & Classes in Los Angeles, SAT Courses & Classes in Atlanta, MCAT Courses & Classes in Washington DC, LSAT Courses & Classes in Washington DC, ACT Courses & Classes in Philadelphia, LSAT Courses & Classes in Miami, ACT Courses & Classes in Seattle, SSAT Courses & Classes in Los Angeles, ACT Courses & Classes in Houston, SAT Courses & Classes in Miami

Popular Test Prep

ISEE Test Prep in Philadelphia, SAT Test Prep in Seattle, MCAT Test Prep in Miami, ACT Test Prep in Philadelphia, MCAT Test Prep in Philadelphia, ACT Test Prep in New York City, LSAT Test Prep in Phoenix, GMAT Test Prep in Chicago, MCAT Test Prep in Seattle, ISEE Test Prep in Washington DC

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

All Common Core: 2nd Grade Math Resources

Example Questions

Example Question #303 : Operations

Example Question #1878 : Common Core Math: Grade 2

Example Question #304 : Operations

Example Question #1880 : Common Core Math: Grade 2

Example Question #305 : Operations

Example Question #222 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #223 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #224 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #225 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #226 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

All Common Core: 2nd Grade Math Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: