Strategies for adding and subtracting within 100

Learn strategies for adding and subtracting two-digit numbers.

Adding 53+17 by making a group of 10

Add 2-digit numbers by making tens

Adding by making a group of 10

Add 2-digit numbers by making tens 2

Strategies for adding 2-digit numbers

Select strategies for adding within 100

Addition and subtraction with number lines

Add within 100 using a number line

Subtract within 100 using a number line