Decomposing Numbers as Tens and Ones Worksheets - Free Printable

Let's solve each part of the worksheet step by step and explain the reasoning.

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A) Decompose each number, and write how many tens and ones in each.

We are breaking numbers into tens and ones.

1) 15 = ___ ten and ___ ones
- 15 means 1 group of ten (10) and 5 extra ones.
✔ So: 1 ten and 5 ones

2) 18 = ___ ten and ___ ones
- 18 means 1 group of ten (10) and 8 extra ones.
✔ So: 1 ten and 8 ones

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B) Split each number as tens and ones, and write them in the circles.

We use a "number bond" format: the total is at the top, and we split it into tens and ones below.

1) 16
```
16
/ \
? ?
ten ones
```
- 16 = 10 + 6 → so:
- Ten: 10
- Ones: 6

2) 13
```
13
/ \
? ?
ten ones
```
- 13 = 10 + 3 → so:
- Ten: 10
- Ones: 3

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C) Write how many in all, how many tens, and how many ones.

Now we count objects and break them into tens and ones.

#### 1) Two plates of apples

- First plate: 10 apples (a full group of ten)
- Second plate: 4 apples

Total = 10 + 4 = 14

So:
- Total: 14
- Tens: 1 (because one group of ten)
- Ones: 4

| Total | Ten | Ones |
|-------|-----|------|
| 14 | 1 | 4 |

#### 2) Tens frame and ones frame

- Left side: A ten-frame filled with 10 items (each box has 2 items, 5 boxes → 10)
- Right side: A smaller frame with 2 individual items

So:
- Total = 10 + 2 = 12
- Tens: 1
- Ones: 2

| Total | Ten | Ones |
|-------|-----|------|
| 12 | 1 | 2 |

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✔ Final Answers:

#### A)
1) 15 = 1 ten and 5 ones
2) 18 = 1 ten and 8 ones

#### B)
1)
```
16
/ \
10 6
ten ones
```
2)
```
13
/ \
10 3
ten ones
```

#### C)
1)
| Total | Ten | Ones |
|-------|-----|------|
| 14 | 1 | 4 |

2)
| Total | Ten | Ones |
|-------|-----|------|
| 12 | 1 | 2 |

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This worksheet teaches place value — understanding that numbers like 15 or 18 are made up of one ten and some ones, which helps build foundational math skills for addition and subtraction.