Let's solve each equation step by step. These are basic algebraic equations where we need to find the missing number (represented by a blank). We'll use inverse operations to isolate the unknown.
---
1. 20 + ___ = 40
Subtract 20 from both sides:
40 - 20 =
20
✔ Answer: 20
---
2. 4 × ___ = 16
Divide both sides by 4:
16 ÷ 4 =
4
✔ Answer: 4
---
3. 37 - ___ = 25
Subtract 25 from 37:
37 - 25 =
12
✔ Answer: 12
---
4. 18 + ___ = 30
Subtract 18 from 30:
30 - 18 =
12
✔ Answer: 12
---
5. 6 × ___ = 24
Divide both sides by 6:
24 ÷ 6 =
4
✔ Answer: 4
---
6. ___ - 10 = 50
Add 10 to both sides:
50 + 10 =
60
✔ Answer: 60
---
7. ___ + 25 = 50
Subtract 25 from 50:
50 - 25 =
25
✔ Answer: 25
---
8. ___ × 4 = 16
Divide both sides by 4:
16 ÷ 4 =
4
✔ Answer: 4
---
9. ___ - 12 = 24
Add 12 to both sides:
24 + 12 =
36
✔ Answer: 36
---
10. ___ + 60 = 80
Subtract 60 from 80:
80 - 60 =
20
✔ Answer: 20
---
11. 40 + ___ = 80
Subtract 40 from 80:
80 - 40 =
40
✔ Answer: 40
---
12. 5 × ___ = 35
Divide both sides by 5:
35 ÷ 5 =
7
✔ Answer: 7
---
13. 35 - ___ = 20
Subtract 20 from 35:
35 - 20 =
15
✔ Answer: 15
---
14. 35 + ___ = 70
Subtract 35 from 70:
70 - 35 =
35
✔ Answer: 35
---
15. 11 × ___ = 66
Divide both sides by 11:
66 ÷ 11 =
6
✔ Answer: 6
---
16. ___ - 30 = 30
Add 30 to both sides:
30 + 30 =
60
✔ Answer: 60
---
17. ___ + 18 = 48
Subtract 18 from 48:
48 - 18 =
30
✔ Answer: 30
---
18. ___ × 7 = 21
Divide both sides by 7:
21 ÷ 7 =
3
✔ Answer: 3
---
19. ___ - 20 = 40
Add 20 to both sides:
40 + 20 =
60
✔ Answer: 60
---
20. ___ + 13 = 26
Subtract 13 from 26:
26 - 13 =
13
✔ Answer: 13
---
✔ Final Answers:
1.
20
2.
4
3.
12
4.
12
5.
4
6.
60
7.
25
8.
4
9.
36
10.
20
11.
40
12.
7
13.
15
14.
35
15.
6
16.
60
17.
30
18.
3
19.
60
20.
13
---
💡
Tip: For these types of problems, remember:
- Addition → Subtract
- Subtraction → Add
- Multiplication → Divide
- Division → Multiply
Use inverse operations to solve for the missing number!
Parent Tip: Review the logic above to help your child master the concept of math worksheets grade 3.
