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

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Add two 3-digit numbers using mental math. Hints are given about how to complete the addition of the place values

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

J. Subtract to the next hundred with and without using a number line model

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

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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