Subtraction concepts

One-Step Equations

100

x – 6 = 12

x = 18

200

y – 3 = 5

y=8

300

a – 10 = –2

a = 8

400

m – 7 = 0

m = 7

500

k – 15 = 1

k = 16

Two-Step Equations

100

2x – 4 = 8

x = 6

200

3y – 9 = 6

y=5

300

5a – 5 = 15

a=4

400

4z – 12 = 16

z = 7

500

7k – 14 = 7

K = 3

Challenging Subtraction

100

57 – 19

38

200

84 – 27

57

300

126 – 48

78

400

235 – 89

146

500

504 – 276

228

The difference

100

What is the difference between 18 and 11?

7

200

You have 45 stickers. Your friend has 32. What is the difference?

13

300

A box holds 60 pencils. After giving away 25, what is the difference?

35

400

School had 120 students last year and 95 this year. What is the difference?

35

500

Last year, a library had 250 books. This year, the library donated 45 books and purchased 80 new books. How many books does the library have now? What is the difference in the number of books compared to last year?

• The library has 285 books now.

• There are 35 more books than last year.

Geometry Equations

100

4x = 20

x=5

200

6x = 24

x=4

300

x + 100 = 180

x = 80

400

2(x + 10) = 30

x = 5

500

x² = 49

x = 7