Curriculum>Grade 2> Module 5>Topic A: Mental Strategies for Addition and Subtraction Within 1,000

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Place a 3-digit multiple of 10 on the number line. Then identify the next multiple of 100 that is less than the number, and say how much you subtract to reach this multiple of 100. Next, complete similar problems but without using the number line model

A. Add and subtract 3-digit numbers with no tens or ones

B. Add 3-digit round numbers with and without using a disk model

C. Subtract 3-digit round numbers with and without using a disk model

D. Add a 2-digit round number to a 3-digit round number by adding hundreds, tens, then ones

E. Add up to the next hundred with and without using a number line model

F. Add a 2-digit number to a 3-digit number using the "Make the Next Hundred" strategy (Part 1)

G. Add a 2-digit number to a 3-digit number using the "Make the Next Hundred" strategy (Part 2)

H. Add a 2-digit round number to a 3-digit round number using mental math

I. Subtract a 2-digit round number from a 3-digit round number by subtracting hundreds, tens, then ones

K. Subtract a 2-digit number from a 3-digit number using the "Make the Previous Hundred" strategy (Part 1)

L. Subtract a 2-digit number from a 3-digit number using the "Make the Previous Hundred" strategy (Part 2)

M. Subtract a 2-digit round number from a 3-digit round number using mental math

N. Break a 3-digit number into hundreds and a 2-digit number

O. Add 3-digit numbers by adding on the hundreds first

P. Add 3-digit numbers using mental math

Q. Add 3-digit numbers with exchanging by adding on the hundreds first

R. Add 3-digit numbers with exchanging using mental math

S. Subtract 3-digit numbers by subtracting the hundreds first

T. Subtract 3-digit numbers using mental math

U. Subtract 3-digit numbers with exchanging by subtracting the hundreds first

V. Subtract 3-digit numbers with exchanging using mental math

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