Colorful mental maths worksheet designed for children, covering number writing, patterns, addition, odd number identification, and place value concepts.

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

Writing numbers

To write these in number form, look at the place values (hundreds, tens, and ones).
* Twenty nine = 29
* Eighty four = 84
* Thirty six = 36
* Three hundred & nineteen = 319
* Fifty two = 52
* Eight hundred & seventy = 870

Patterns

Look at how much the numbers increase by to find the next one.
1. 20, 30, 40... (Counting by 10s) -> Next is 50
2. 15, 20, 25... (Counting by 5s) -> Next is 30
3. 18, 20, 22... (Counting by 2s) -> Next is 24
4. 60, 70, 80... (Counting by 10s) -> Next is 90
5. 25, 27, 29... (Counting by 2s) -> Next is 31
6. 35, 40, 45... (Counting by 5s) -> Next is 50

Addition

Break the numbers down if it helps. For example, $22 + 9$ is like $22 + 8 + 1$.
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 always end in 1, 3, 5, 7, or 9. Even numbers end in 0, 2, 4, 6, or 8. You should shade:
* 89, 95, 45, 43, 35
* 21, 17, 19
* 11, 9, 127
* 197, 175, 125

*(Do not shade numbers like 128, 44, 26, 22, 88, 24, 36, 62, 12, 130, 188, 74, 72, 66 because they are even).*

How many tens and ones?

Look at the digits. The first digit is the Tens, and the second 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:
1. 8, 8
2. 3, 9
3. 4, 1
4. 5, 9
5. 7, 3