Grade 3 Mental Math Worksheets | Free Worksheets | Printables - Free Printable
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Show Answer Key & Explanations
Step-by-step solution for: Grade 3 Mental Math Worksheets | Free Worksheets | Printables
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Show Answer Key & Explanations
Step-by-step solution for: Grade 3 Mental Math Worksheets | Free Worksheets | Printables
Let's solve each day's mental maths problems step by step and explain the solutions.
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1. 40 × 5 =
$ 40 \times 5 = 200 $
2. 420 ÷ 7 =
$ 420 \div 7 = 60 $
3. 162 + 282 =
$ 162 + 282 = 444 $
4. 156 - 95 =
$ 156 - 95 = 61 $
5. Area of a shape that is 12m × 12m?
Area = length × width = $ 12 \times 12 = 144 \, \text{m}^2 $
6. $ \frac{3}{5} - \frac{1}{5} = $
Same denominator: $ \frac{3-1}{5} = \frac{2}{5} $
7. $ 5^2 = $
$ 5 \times 5 = 25 $
8. 280 cm = ___ m
$ 100 \, \text{cm} = 1 \, \text{m} $ → $ 280 \div 100 = 2.8 \, \text{m} $
9. Order decimals in ascending order: 0.8, 0.5, 0.3, 0.7
Compare: 0.3 < 0.5 < 0.7 < 0.8
→ 0.3, 0.5, 0.7, 0.8
10. Fill in the missing operation: 9 ___ 9 = 81
$ 9 \times 9 = 81 $ → Answer: ×
---
1. 70 × 8 =
$ 70 \times 8 = 560 $
2. 810 ÷ 9 =
$ 810 \div 9 = 90 $
3. 155 + 365 =
$ 155 + 365 = 520 $
4. 363 - 112 =
$ 363 - 112 = 251 $
5. Area of a shape that is 14m × 5m?
$ 14 \times 5 = 70 \, \text{m}^2 $
6. $ \frac{4}{7} - \frac{3}{7} = $
$ \frac{4-3}{7} = \frac{1}{7} $
7. $ 8^2 = $
$ 8 \times 8 = 64 $
8. 5.5m = ___ cm
$ 5.5 \times 100 = 550 \, \text{cm} $
9. Order decimals in descending order: 1.8, 1.81, 1.18, 1.08
Compare:
- 1.81 > 1.8 > 1.18 > 1.08
→ 1.81, 1.8, 1.18, 1.08
10. Fill in the missing operation: 82 ___ 41 = 41
$ 82 - 41 = 41 $ → Answer: −
---
1. 60 × 4 =
$ 60 \times 4 = 240 $
2. 490 ÷ 7 =
$ 490 \div 7 = 70 $
3. 760 + 143 =
$ 760 + 143 = 903 $
4. 185 - 62 =
$ 185 - 62 = 123 $
5. Area of a shape that is 22m × 6m?
$ 22 \times 6 = 132 \, \text{m}^2 $
6. $ \frac{8}{10} - \frac{4}{10} = $
$ \frac{8-4}{10} = \frac{4}{10} = \frac{2}{5} $
7. $ 2^2 = $
$ 2 \times 2 = 4 $
8. 95cm = ___ m
$ 95 \div 100 = 0.95 \, \text{m} $
9. Order decimals in ascending order: 3.2, 3.02, 3.12, 3.21
Compare:
- 3.02 < 3.12 < 3.2 < 3.21
→ 3.02, 3.12, 3.2, 3.21
10. Fill in the missing operation: 80 ___ 6 = 480
$ 80 \times 6 = 480 $ → Answer: ×
---
1. 90 × 9 =
$ 90 \times 9 = 810 $
2. 960 ÷ 12 =
$ 960 \div 12 = 80 $
3. 146 + 295 =
$ 146 + 295 = 441 $
4. 97 - 44 =
$ 97 - 44 = 53 $
5. Area of a shape that is 15m × 8m?
$ 15 \times 8 = 120 \, \text{m}^2 $
6. $ \frac{3}{5} - \frac{2}{5} = $
$ \frac{3-2}{5} = \frac{1}{5} $
7. $ 9^2 = $
$ 9 \times 9 = 81 $
8. 3.2m = ___ cm
$ 3.2 \times 100 = 320 \, \text{cm} $
9. Order decimals in descending order: 2.1, 2.21, 2.01, 2.19
Compare:
- 2.21 > 2.19 > 2.1 > 2.01
→ 2.21, 2.19, 2.1, 2.01
10. Fill in the missing operation: 96 ___ 8 = 12
$ 96 \div 8 = 12 $ → Answer: ÷
---
#### Monday
1. 200
2. 60
3. 444
4. 61
5. 144 m²
6. $ \frac{2}{5} $
7. 25
8. 2.8 m
9. 0.3, 0.5, 0.7, 0.8
10. ×
#### Tuesday
1. 560
2. 90
3. 520
4. 251
5. 70 m²
6. $ \frac{1}{7} $
7. 64
8. 550 cm
9. 1.81, 1.8, 1.18, 1.08
10. −
#### Wednesday
1. 240
2. 70
3. 903
4. 123
5. 132 m²
6. $ \frac{2}{5} $
7. 4
8. 0.95 m
9. 3.02, 3.12, 3.2, 3.21
10. ×
#### Thursday
1. 810
2. 80
3. 441
4. 53
5. 120 m²
6. $ \frac{1}{5} $
7. 81
8. 320 cm
9. 2.21, 2.19, 2.1, 2.01
10. ÷
---
✔ All problems solved! Let me know if you'd like this formatted as a printable worksheet or need explanations for any specific question.
---
Monday
1. 40 × 5 =
$ 40 \times 5 = 200 $
2. 420 ÷ 7 =
$ 420 \div 7 = 60 $
3. 162 + 282 =
$ 162 + 282 = 444 $
4. 156 - 95 =
$ 156 - 95 = 61 $
5. Area of a shape that is 12m × 12m?
Area = length × width = $ 12 \times 12 = 144 \, \text{m}^2 $
6. $ \frac{3}{5} - \frac{1}{5} = $
Same denominator: $ \frac{3-1}{5} = \frac{2}{5} $
7. $ 5^2 = $
$ 5 \times 5 = 25 $
8. 280 cm = ___ m
$ 100 \, \text{cm} = 1 \, \text{m} $ → $ 280 \div 100 = 2.8 \, \text{m} $
9. Order decimals in ascending order: 0.8, 0.5, 0.3, 0.7
Compare: 0.3 < 0.5 < 0.7 < 0.8
→ 0.3, 0.5, 0.7, 0.8
10. Fill in the missing operation: 9 ___ 9 = 81
$ 9 \times 9 = 81 $ → Answer: ×
---
Tuesday
1. 70 × 8 =
$ 70 \times 8 = 560 $
2. 810 ÷ 9 =
$ 810 \div 9 = 90 $
3. 155 + 365 =
$ 155 + 365 = 520 $
4. 363 - 112 =
$ 363 - 112 = 251 $
5. Area of a shape that is 14m × 5m?
$ 14 \times 5 = 70 \, \text{m}^2 $
6. $ \frac{4}{7} - \frac{3}{7} = $
$ \frac{4-3}{7} = \frac{1}{7} $
7. $ 8^2 = $
$ 8 \times 8 = 64 $
8. 5.5m = ___ cm
$ 5.5 \times 100 = 550 \, \text{cm} $
9. Order decimals in descending order: 1.8, 1.81, 1.18, 1.08
Compare:
- 1.81 > 1.8 > 1.18 > 1.08
→ 1.81, 1.8, 1.18, 1.08
10. Fill in the missing operation: 82 ___ 41 = 41
$ 82 - 41 = 41 $ → Answer: −
---
Wednesday
1. 60 × 4 =
$ 60 \times 4 = 240 $
2. 490 ÷ 7 =
$ 490 \div 7 = 70 $
3. 760 + 143 =
$ 760 + 143 = 903 $
4. 185 - 62 =
$ 185 - 62 = 123 $
5. Area of a shape that is 22m × 6m?
$ 22 \times 6 = 132 \, \text{m}^2 $
6. $ \frac{8}{10} - \frac{4}{10} = $
$ \frac{8-4}{10} = \frac{4}{10} = \frac{2}{5} $
7. $ 2^2 = $
$ 2 \times 2 = 4 $
8. 95cm = ___ m
$ 95 \div 100 = 0.95 \, \text{m} $
9. Order decimals in ascending order: 3.2, 3.02, 3.12, 3.21
Compare:
- 3.02 < 3.12 < 3.2 < 3.21
→ 3.02, 3.12, 3.2, 3.21
10. Fill in the missing operation: 80 ___ 6 = 480
$ 80 \times 6 = 480 $ → Answer: ×
---
Thursday
1. 90 × 9 =
$ 90 \times 9 = 810 $
2. 960 ÷ 12 =
$ 960 \div 12 = 80 $
3. 146 + 295 =
$ 146 + 295 = 441 $
4. 97 - 44 =
$ 97 - 44 = 53 $
5. Area of a shape that is 15m × 8m?
$ 15 \times 8 = 120 \, \text{m}^2 $
6. $ \frac{3}{5} - \frac{2}{5} = $
$ \frac{3-2}{5} = \frac{1}{5} $
7. $ 9^2 = $
$ 9 \times 9 = 81 $
8. 3.2m = ___ cm
$ 3.2 \times 100 = 320 \, \text{cm} $
9. Order decimals in descending order: 2.1, 2.21, 2.01, 2.19
Compare:
- 2.21 > 2.19 > 2.1 > 2.01
→ 2.21, 2.19, 2.1, 2.01
10. Fill in the missing operation: 96 ___ 8 = 12
$ 96 \div 8 = 12 $ → Answer: ÷
---
✔ Final Answers Summary
#### Monday
1. 200
2. 60
3. 444
4. 61
5. 144 m²
6. $ \frac{2}{5} $
7. 25
8. 2.8 m
9. 0.3, 0.5, 0.7, 0.8
10. ×
#### Tuesday
1. 560
2. 90
3. 520
4. 251
5. 70 m²
6. $ \frac{1}{7} $
7. 64
8. 550 cm
9. 1.81, 1.8, 1.18, 1.08
10. −
#### Wednesday
1. 240
2. 70
3. 903
4. 123
5. 132 m²
6. $ \frac{2}{5} $
7. 4
8. 0.95 m
9. 3.02, 3.12, 3.2, 3.21
10. ×
#### Thursday
1. 810
2. 80
3. 441
4. 53
5. 120 m²
6. $ \frac{1}{5} $
7. 81
8. 320 cm
9. 2.21, 2.19, 2.1, 2.01
10. ÷
---
✔ All problems solved! Let me know if you'd like this formatted as a printable worksheet or need explanations for any specific question.
Parent Tip: Review the logic above to help your child master the concept of mental math worksheets.
