Grade 3 Mental Maths worksheet featuring daily math exercises for Monday through Thursday, designed to enhance arithmetic skills.

Let’s go day by day and solve each problem carefully.

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Monday

1. 19 + 19 =
→ 19 + 19 is like 20 + 20 minus 2 → 40 - 2 = 38

2. 90 - 18 =
→ 90 - 10 = 80, then 80 - 8 = 72

3. 9 × 4 =
→ 9 groups of 4: 4+4+4+4+4+4+4+4+4 = 36

4. What’s halfway between 70 & 80?
→ Halfway means average: (70 + 80) ÷ 2 = 150 ÷ 2 = 75

5. Value of the 8 in 861?
→ 8 is in the hundreds place → 800

6. How many sides does a square have?
→ A square has 4 equal sides.

7. Write =, > or < : 112 ___ 110
→ 112 is bigger than 110 → >

8. 80 + ___ = 210
→ 210 - 80 = 130

9. 9.2 + 0.3 =
→ 9.2 + 0.3 = 9.5

10. How many 6s make 24?
→ 24 ÷ 6 = 4

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Tuesday

1. 36 + 35 =
→ 36 + 30 = 66, then +5 = 71

2. 135 - 95 =
→ 135 - 90 = 45, then -5 = 40

3. 8 × 3 =
→ 8 + 8 + 8 = 24

4. What’s halfway between 60 & 100?
→ (60 + 100) ÷ 2 = 160 ÷ 2 = 80

5. Value of the 2 in 682?
→ 2 is in the ones place → 2

6. How many sides does a pentagon have?
→ Pentagon = 5 sides

7. Write =, > or < : 91 ___ 91
→ They are equal → =

8. 57 + ___ = 117
→ 117 - 57 = 60

9. 8.5 + 1.5 =
→ 8.5 + 1.5 = 10.0 or just 10

10. How many 3s make 27?
→ 27 ÷ 3 = 9

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Wednesday

1. 115 + 90 =
→ 115 + 90 = 205 → 205

2. 62 - 31 =
→ 62 - 30 = 32, then -1 = 31

3. 12 × 2 =
→ 12 + 12 = 24

4. What’s halfway between 12 & 24?
→ (12 + 24) ÷ 2 = 36 ÷ 2 = 18

5. Value of the 3 in 3975?
→ 3 is in the thousands place → 3000

6. How many sides does an oval have?
→ An oval is curved — it has 0 straight sides.

7. Write =, > or < : 52 ___ 25
→ 52 is bigger → >

8. 250 + ___ = 600
→ 600 - 250 = 350

9. 3.6 + 0.4 =
→ 3.6 + 0.4 = 4.0 or 4

10. How many 5s make 40?
→ 40 ÷ 5 = 8

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Thursday

1. 44 + 25 =
→ 44 + 20 = 64, then +5 = 69

2. 54 - 18 =
→ 54 - 10 = 44, then -8 = 36

3. 7 × 5 =
→ 7 + 7 + 7 + 7 + 7 = 35

4. What’s halfway between 24 & 30?
→ (24 + 30) ÷ 2 = 54 ÷ 2 = 27

5. Value of the 9 in 5941?
→ 9 is in the hundreds place → 900

6. How many sides does a triangle have?
→ Triangle = 3 sides

7. Write =, > or < : 17 ___ 71
→ 17 is smaller → <

8. 14 + ___ = 28
→ 28 - 14 = 14

9. 2.5 + 2.5 =
→ 2.5 + 2.5 = 5.0 or 5

10. How many 10s make 60?
→ 60 ÷ 10 = 6

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Final Answer:

Monday:
1. 38
2. 72
3. 36
4. 75
5. 800
6. 4
7. >
8. 130
9. 9.5
10. 4

Tuesday:
1. 71
2. 40
3. 24
4. 80
5. 2
6. 5
7. =
8. 60
9. 10
10. 9

Wednesday:
1. 205
2. 31
3. 24
4. 18
5. 3000
6. 0
7. >
8. 350
9. 4
10. 8

Thursday:
1. 69
2. 36
3. 35
4. 27
5. 900
6. 3
7. <
8. 14
9. 5
10. 6