Grade 3 Mental Maths worksheet featuring daily addition exercises for Monday through Thursday.

Sure! Let’s solve all the addition problems in this Grade 3 Mental Maths worksheet. Since it’s “mental maths,” we’ll solve them using simple mental strategies — breaking numbers apart, adding tens and ones separately, or using friendly numbers.

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## 🟦 Monday

1. 52 + 53
→ 50 + 50 = 100, 2 + 3 = 5 → 105

2. 44 + 66
→ 40 + 60 = 100, 4 + 6 = 10 → 110

3. 61 + 35
→ 60 + 30 = 90, 1 + 5 = 6 → 96

4. 83 + 60
→ 80 + 60 = 140, +3 → 143

5. 36 + 42
→ 30 + 40 = 70, 6 + 2 = 8 → 78

6. 80 + 90
→ 8 + 9 = 17 → 170

7. 30 + 65
→ 30 + 60 = 90, +5 → 95

8. 120 + 140
→ 12 + 14 = 26 → 260

9. 260 + 90
→ 260 + 100 = 360 - 10 → 350

10. 210 + 310
→ 200 + 300 = 500, 10 + 10 = 20 → 520

✔ Monday Answers:
1. 105 2. 110 3. 96 4. 143 5. 78 6. 170 7. 95 8. 260 9. 350 10. 520

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## 🟩 Tuesday

1. 25 + 35
→ 20 + 30 = 50, 5 + 5 = 10 → 60

2. 37 + 11
→ 37 + 10 = 47, +1 → 48

3. 97 + 43
→ 97 + 3 = 100, then +40 → 140

4. 52 + 25
→ 50 + 20 = 70, 2 + 5 = 7 → 77

5. 81 + 13
→ 81 + 10 = 91, +3 → 94

6. 40 + 70
→ 4 + 7 = 11 → 110

7. 95 + 95
→ 100 + 100 = 200, minus 5 and 5 → 200 - 10 = 190

8. 250 + 250
→ Half of 500 → 500

9. 50 + 75
→ 50 + 50 = 100, +25 → 125

10. 130 + 80
→ 130 + 70 = 200, +10 → 210

✔ Tuesday Answers:
1. 60 2. 48 3. 140 4. 77 5. 94 6. 110 7. 190 8. 500 9. 125 10. 210

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## 🟨 Wednesday

1. 46 + 23
→ 40 + 20 = 60, 6 + 3 = 9 → 69

2. 19 + 13
→ 19 + 10 = 29, +3 → 32

3. 18 + 31
→ 18 + 30 = 48, +1 → 49

4. 34 + 32
→ 30 + 30 = 60, 4 + 2 = 6 → 66

5. 76 + 23
→ 76 + 20 = 96, +3 → 99

6. 90 + 90
→ 9 + 9 = 18 → 180

7. 60 + 50
→ 6 + 5 = 11 → 110

8. 325 + 80
→ 325 + 75 = 400, +5 → 405

9. 80 + 90
→ 8 + 9 = 17 → 170

10. 160 + 70
→ 160 + 40 = 200, +30 → 230

✔ Wednesday Answers:
1. 69 2. 32 3. 49 4. 66 5. 99 6. 180 7. 110 8. 405 9. 170 10. 230

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## 🟪 Thursday

1. 81 + 30
→ 81 + 30 = 111

2. 27 + 24
→ 27 + 20 = 47, +4 → 51

3. 52 + 57
→ 50 + 50 = 100, 2 + 7 = 9 → 109

4. 29 + 28
→ 30 + 30 = 60, minus 1 and 2 → 60 - 3 = 57

5. 16 + 17
→ 16 + 10 = 26, +7 → 33

6. 75 + 75
→ 70 + 70 = 140, 5 + 5 = 10 → 150

7. 70 + 70
→ 7 + 7 = 14 → 140

8. 150 + 110
→ 150 + 100 = 250, +10 → 260

9. 60 + 160
→ 60 + 160 = 220

10. 110 + 65
→ 110 + 60 = 170, +5 → 175

✔ Thursday Answers:
1. 111 2. 51 3. 109 4. 57 5. 33 6. 150 7. 140 8. 260 9. 220 10. 175

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## ✔ Final Answer Key:

Monday

1. 105 2. 110 3. 96 4. 143 5. 78 6. 170 7. 95 8. 260 9. 350 10. 520

Tuesday

1. 60 2. 48 3. 140 4. 77 5. 94 6. 110 7. 190 8. 500 9. 125 10. 210

Wednesday

1. 69 2. 32 3. 49 4. 66 5. 99 6. 180 7. 110 8. 405 9. 170 10. 230

Thursday

1. 111 2. 51 3. 109 4. 57 5. 33 6. 150 7. 140 8. 260 9. 220 10. 175

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💡 Tips for Mental Math:
- Break numbers into tens and ones.
- Use “make a ten” strategy (e.g., 97 + 43 → 97 + 3 = 100).
- Round and adjust (e.g., 29 + 28 → 30 + 30 = 60 - 3 = 57).

You can now fill in the blanks and score yourself — each day is out of 10!

Let me know if you’d like a printable version or explanation for any specific problem! 😊