Mental Maths Worksheet for Kids - Practice Writing Numbers, Patterns, Addition, Odd Numbers, and Tens & Ones.

Here are the solutions for each section of your mental maths worksheet.

Writing numbers

To write these in digits, look at the place values (hundreds, tens, and ones).
1. Twenty nine → 29
2. Eighty four → 84
3. Thirty six → 36
4. Three hundred & nineteen → 319
5. Fifty two → 52
6. Eight hundred & seventy → 870

Patterns

Look at how much the numbers go up by each time.
1. 20, 30, 40... (Counting by 10s) → 50
2. 15, 20, 25... (Counting by 5s) → 30
3. 18, 20, 22... (Counting by 2s) → 24
4. 60, 70, 80... (Counting by 10s) → 90
5. 25, 27, 29... (Counting by 2s) → 31
6. 35, 40, 45... (Counting by 5s) → 50

Addition

1. 22 + 9 = 31
2. 44 + 7 = 51
3. 8 + 33 = 41
4. 6 + 19 = 25
5. 15 + 11 = 26
6. 27 + 12 = 39
7. 50 + 30 = 80
8. 10 + 80 = 90
9. 70 + 20 = 90
10. 30 + 60 = 90
11. 10 + 30 = 40
12. 50 + 20 = 70

Shade odd numbers

Odd numbers end in 1, 3, 5, 7, or 9. Even numbers end in 0, 2, 4, 6, or 8. You should shade:
* Row 1: 89, 95, 45, 43, 35
* Row 2: 21, 17, 19
* Row 3: 11, 9, 127
* Row 4: 197, 175, 125

*(Do not shade: 128, 44, 26, 22, 88, 24, 36, 62, 12, 130, 188, 74, 72, 66)*

How many tens and ones?

Break the number down. The first digit is the tens, and the last digit is the ones.
1. 88 → Tens = 8, Ones = 8
2. 39 → Tens = 3, Ones = 9
3. 41 → Tens = 4, Ones = 1
4. 59 → Tens = 5, Ones = 9
5. 73 → Tens = 7, Ones = 3

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Final Answer:
Writing numbers: 29, 84, 36, 319, 52, 870
Patterns: 50, 30, 24, 90, 31, 50
Addition: 31, 51, 41, 25, 26, 39, 80, 90, 90, 90, 40, 70
Shade odd numbers: 89, 95, 45, 43, 35, 21, 17, 19, 11, 9, 127, 197, 175, 125
Tens and ones: (8, 8), (3, 9), (4, 1), (5, 9), (7, 3)