Grade 3 Mental Math Worksheet with daily problems from Monday to Thursday.

Let's solve the problems step by step for each day.

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Monday

1. 65 + 23 =
- Add the numbers: \( 65 + 23 = 88 \)
- Answer: 88

2. 72 - 15 =
- Subtract the numbers: \( 72 - 15 = 57 \)
- Answer: 57

3. 8 × 5 =
- Multiply the numbers: \( 8 \times 5 = 40 \)
- Answer: 40

4. What's halfway between 50 & 100?
- Find the midpoint: \( \frac{50 + 100}{2} = \frac{150}{2} = 75 \)
- Answer: 75

5. Value of the 4 in 482?
- The digit 4 is in the hundreds place, so its value is \( 4 \times 100 = 400 \)
- Answer: 400

6. How many sides does a decagon have?
- A decagon has 10 sides.
- Answer: 10

7. Write =, >, or <: 82 ____ 82
- Compare the numbers: \( 82 = 82 \)
- Answer: =

8. 25 + ____ = 52
- Solve for the missing number: \( 52 - 25 = 27 \)
- Answer: 27

9. 1.5 + 1.5 =
- Add the decimals: \( 1.5 + 1.5 = 3.0 \)
- Answer: 3.0

10. How many 5s make 25?
- Divide 25 by 5: \( 25 \div 5 = 5 \)
- Answer: 5

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Tuesday

1. 29 + 13 =
- Add the numbers: \( 29 + 13 = 42 \)
- Answer: 42

2. 95 - 22 =
- Subtract the numbers: \( 95 - 22 = 73 \)
- Answer: 73

3. 12 × 5 =
- Multiply the numbers: \( 12 \times 5 = 60 \)
- Answer: 60

4. What's halfway between 30 & 50?
- Find the midpoint: \( \frac{30 + 50}{2} = \frac{80}{2} = 40 \)
- Answer: 40

5. Value of the 6 in 162?
- The digit 6 is in the tens place, so its value is \( 6 \times 10 = 60 \)
- Answer: 60

6. How many sides does a hexagon have?
- A hexagon has 6 sides.
- Answer: 6

7. Write =, >, or <: 44 ____ 54
- Compare the numbers: \( 44 < 54 \)
- Answer: <

8. 93 + ____ = 113
- Solve for the missing number: \( 113 - 93 = 20 \)
- Answer: 20

9. 1.3 + 0.3 =
- Add the decimals: \( 1.3 + 0.3 = 1.6 \)
- Answer: 1.6

10. How many 2s make 18?
- Divide 18 by 2: \( 18 \div 2 = 9 \)
- Answer: 9

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Wednesday

1. 84 + 26 =
- Add the numbers: \( 84 + 26 = 110 \)
- Answer: 110

2. 71 - 21 =
- Subtract the numbers: \( 71 - 21 = 50 \)
- Answer: 50

3. 8 × 4 =
- Multiply the numbers: \( 8 \times 4 = 32 \)
- Answer: 32

4. What's halfway between 16 & 20?
- Find the midpoint: \( \frac{16 + 20}{2} = \frac{36}{2} = 18 \)
- Answer: 18

5. Value of the 9 in 392?
- The digit 9 is in the tens place, so its value is \( 9 \times 10 = 90 \)
- Answer: 90

6. How many sides does a nonagon have?
- A nonagon has 9 sides.
- Answer: 9

7. Write =, >, or <: 75 ____ 57
- Compare the numbers: \( 75 > 57 \)
- Answer: >

8. 150 + ____ = 325
- Solve for the missing number: \( 325 - 150 = 175 \)
- Answer: 175

9. 0.2 + 0.6 =
- Add the decimals: \( 0.2 + 0.6 = 0.8 \)
- Answer: 0.8

10. How many 3s make 15?
- Divide 15 by 3: \( 15 \div 3 = 5 \)
- Answer: 5

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Thursday

1. 18 + 18 =
- Add the numbers: \( 18 + 18 = 36 \)
- Answer: 36

2. 96 - 43 =
- Subtract the numbers: \( 96 - 43 = 53 \)
- Answer: 53

3. 7 × 4 =
- Multiply the numbers: \( 7 \times 4 = 28 \)
- Answer: 28

4. What's halfway between 18 & 22?
- Find the midpoint: \( \frac{18 + 22}{2} = \frac{40}{2} = 20 \)
- Answer: 20

5. Value of the 6 in 6381?
- The digit 6 is in the thousands place, so its value is \( 6 \times 1000 = 6000 \)
- Answer: 6000

6. How many sides does a circle have?
- A circle has 0 sides.
- Answer: 0

7. Write =, >, or <: 18 ____ 19
- Compare the numbers: \( 18 < 19 \)
- Answer: <

8. 51 + ____ = 77
- Solve for the missing number: \( 77 - 51 = 26 \)
- Answer: 26

9. 4.5 + 1.5 =
- Add the decimals: \( 4.5 + 1.5 = 6.0 \)
- Answer: 6.0

10. How many 10s make 100?
- Divide 100 by 10: \( 100 \div 10 = 10 \)
- Answer: 10

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Final Answers:

- Monday: 88, 57, 40, 75, 400, 10, =, 27, 3.0, 5
- Tuesday: 42, 73, 60, 40, 60, 6, <, 20, 1.6, 9
- Wednesday: 110, 50, 32, 18, 90, 9, >, 175, 0.8, 5
- Thursday: 36, 53, 28, 20, 6000, 0, <, 26, 6.0, 10

Boxed Final Answer:
\[
\boxed{
\begin{array}{l}
\text{Monday: } 88, 57, 40, 75, 400, 10, =, 27, 3.0, 5 \\
\text{Tuesday: } 42, 73, 60, 40, 60, 6, <, 20, 1.6, 9 \\
\text{Wednesday: } 110, 50, 32, 18, 90, 9, >, 175, 0.8, 5 \\
\text{Thursday: } 36, 53, 28, 20, 6000, 0, <, 26, 6.0, 10
\end{array}
}
\]