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Reteach and Skills Practice Workbook

Reteach and Skills Practice Workbook

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3–1<br />

Name<br />

<strong>Reteach</strong><br />

Addition <strong>and</strong> Subtraction Expressions<br />

Date<br />

A variable is a letter or symbol that represents an unknown number.<br />

In the expression 5 + x, the unknown number is represented by the<br />

variable x.<br />

You can find the value of an expression by substituting different<br />

numbers for the variable.<br />

4AF1.1<br />

Chapter Resources<br />

Find the value of 5 + x<br />

when x = 2.<br />

5 + x<br />

5 + 2 = 7<br />

So, the value of 5 + x<br />

when x = 2 is 7.<br />

Find the value of 5 + x<br />

when x = 5.<br />

5 + x<br />

5 + 5 = 10<br />

So, the value of 5 + x<br />

when x = 5 is 10.<br />

Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.<br />

Find the value of m - 3<br />

when m = 7.<br />

m - 3<br />

7 - 3 = 4<br />

So, the value of m - 3<br />

when m = 7 is 4.<br />

Find the value of m - 3<br />

when m = 10.<br />

m - 3<br />

10 - 3 = 7<br />

So, the value of m - 3<br />

when m = 10 is 7.<br />

Find the value of each expression if m = 7 <strong>and</strong> s = 3.<br />

1. m + 1 2. s + 2<br />

3. 5 + s 4. 3 + m<br />

5. 7 - m 6. 19 - s<br />

Find the value of each expression if b = 9 <strong>and</strong> e = 4.<br />

7. b + 3 8. b + 8<br />

9. e + 4 10. e + 6<br />

11. b - e 12. (e + 2) - 3<br />

Grade 4 37 Chapter 3

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