4MA5

LO3

Factor Cross Out

Formative Assessment:

What is a factor?

What is a multiple?

What’s the difference between a factor and a multiple?

Instructional Strategies or Activities:

Design a grid that is five over and five across on half a sheet of paper. Place 25 random numbers in the boxes. Decide what numbers to use according to the factors and multiples in the questions that follow. Example:

6 35 3 10 26

13 20 22 4 14

49 2 21 42 15

40 28 5 25 17

12 16 7 24 13

1. Cross out all the factors of 24.

2. Circle all the multiples of 5.

3. Circle all the multiples of 7.

4. Cross out all the factors of 26.

Summative Assessment:

Check papers for accuracy. Have students design their own cross out sheet.