Writing Equations
100

Write an equation for "Five more than a number is 12

x + 5=12

200

Write an equation for "Three times a number equals 21"

3x=21

300

If a number decreased by 9 equals 15, write the equation. 

x − 9 =15

400

Write an equation for "The sum of twice a number and 4 is 18.

2x + 4 =18

500

Create an equation to represent "The product of a number and 7 is 42.

7x = 42