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

Back

Fullscreen

Add a three-digit multiple of 10 and a three-digit multiple of 100, first using the disk model, and then without the model. See that adding a multiple of 100 to another three digit number means adding the hundreds digits together

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

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

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

View more...