## Subtraction by Expansion

Solve subtraction problems by first expanding both numbers. You make your own problems to be solved.

Investigate a method to subtract numbers up to two decimal places. Use units in measurement. Use money related to shopping, purchasing and giving change. ## Addition by Expansion

A teaching tool which demonstrates expanded addition of large numbers including decimals. You make your own problems to be solved.

Investigate a method to add numbers up to two decimal places. Use units in measurement. Use money related to shopping, purchasing and giving change. ## Addition Algorithm – MAB Demonstration

Visually demonstrate using MAB how to add 2- and 3-digit numbers. ## Arrays

A tool to teach multiplication or division using arrays. Show students that 3 x 5 = 5 x 3 or that 6 x 5 = 3 x 5 doubled, etc ## TU x U Short Multiplication

Solve multiplication problems using the distributive property of multiplication; for example, 23 x 4 = (20 x 4) + (3×4) ## HTU x U Short Multiplication

Solve multiplication problems using the distributive property of multiplication; for example, 342 x 3 = (300 x 3) + (40 x 3) + (2×3). ## Multiplication using the Grid Method

Solve multiplication problems, such as 23 x 43, using the grid method. 