MATH FOR KIDS

I. CHANGE SIDE, CHANGE SIGN
Solve each equation. Show your working.

1. 2x − 5 = 9

2. 3x − 7 = 11

3. 4x − 9 = 15

4. 5x + 6 = 31

5. 7x − 12 = 30

II. VARIABLES ON BOTH SIDES

Solve each equation using “change side, change sign”.

1. 2x − 6 = x + 5

2. 3x − 8 = x + 10

3. 4x + 3 = 2x + 17

4. 5x − 11 = 2x + 10

5. 6x + 4 = 3x + 25

6. 2x − 9 = 5 − x

7. 3x − 10 = 8 − 2x

8. 7 − 2x = x − 8

III. SIMULTANEOUS EQUATIONS

Solve the following system of equations. Show your working.

A + B = 14

A + C = 12

B + C = 10

IV. A rectangular prism has a volume of 240 cm³. Its length is 10 cm and its width is 6 cm. Find its height.

V. Explain why increasing every length by a factor of 10 increases the volume by a factor of 1,000 for any pair of similar three-dimensional shapes.