Math worksheet for practicing addition and subtraction with variables within 20.

Let’s solve each problem one by one. We’re finding the value of a letter in simple addition and subtraction equations, all within 20.

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1) 20 - 13 = B
20 minus 13 is 7 → B = 7

2) 20 = 7 + A
What number added to 7 makes 20? 20 - 7 = 13 → A = 13

3) E = 4 + 1
4 plus 1 is 5 → E = 5

4) 14 + 1 = K
14 plus 1 is 15 → K = 15

5) 5 - Y = 3
What do you subtract from 5 to get 3? 5 - 3 = 2 → Y = 2

6) V + 18 = 20
What number plus 18 equals 20? 20 - 18 = 2 → V = 2

7) 8 = 4 + W
What number added to 4 gives 8? 8 - 4 = 4 → W = 4

8) F = 19 - 4
19 minus 4 is 15 → F = 15

9) J + 9 = 13
What number plus 9 equals 13? 13 - 9 = 4 → J = 4

10) 7 = L - 5
What number minus 5 equals 7? 7 + 5 = 12 → L = 12

11) S = 9 + 11
9 plus 11 is 20 → S = 20

12) M - 15 = 1
What number minus 15 equals 1? 1 + 15 = 16 → M = 16

13) 12 = G + 8
What number added to 8 gives 12? 12 - 8 = 4 → G = 4

14) 12 - 9 = Z
12 minus 9 is 3 → Z = 3

15) 13 - Q = 7
What do you subtract from 13 to get 7? 13 - 7 = 6 → Q = 6

16) 14 + C = 16
What number plus 14 equals 16? 16 - 14 = 2 → C = 2

17) 11 = H - 4
What number minus 4 equals 11? 11 + 4 = 15 → H = 15

18) 8 + 5 = N
8 plus 5 is 13 → N = 13

19) 12 + U = 17
What number plus 12 equals 17? 17 - 12 = 5 → U = 5

20) 3 = 12 - R
What number subtracted from 12 gives 3? 12 - 3 = 9 → R = 9

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Final Answer:
1. B = 7
2. A = 13
3. E = 5
4. K = 15
5. Y = 2
6. V = 2
7. W = 4
8. F = 15
9. J = 4
10. L = 12
11. S = 20
12. M = 16
13. G = 4
14. Z = 3
15. Q = 6
16. C = 2
17. H = 15
18. N = 13
19. U = 5
20. R = 9