Need some help....to help at home?

__Addition/Subtraction Strategies__

Students are reviewing several different strategies for addition and subtraction. It is not uncommon for families to experience confusion when they are trying to help at home. For most of us, we were given a set of steps to complete in order to solve a problem. Everyday Math likes to show students several ways to solve a problem and then leave it up to them to use the method that works best. Unless a homework says exactly which method to use, student’s may use whichever they prefer.

This includes:

using a number grid (100s chart)

using manipulatives (objects such as buttons, beads, etc.)

partial sums method (see video tutorial below)

mental computations (see two examples below)

&

ballpark estimate (used to check if their answer is likely accurate)

__ Look at the two addition strategies below. See if you can figure out how they work.__

Louisa’s Strategy Lee’s Strategy

37 + 44 = ? 37 + 44 = ?

37 + 40 = 77 40 + 44 = 84

77 + 4 = 81 84 - 3 = 81

37 + 44 = 81 37 + 44 = 81

__Addition/Subtraction Strategies__