Absolutely! Let’s solve each part of this worksheet step by step, explaining how to decompose numbers into
tens and ones — a foundational concept in early math.
---
## 🔢 PART A: Decompose each number, and write how many tens and ones in each.
1) 15 = ___ ten and ___ ones
- The number
15 means:
-
1 ten (because the “1” is in the tens place)
-
5 ones (because the “5” is in the ones place)
✔ Answer:
15 = 1 ten and 5 ones
---
2) 18 = ___ ten and ___ ones
- The number
18 means:
-
1 ten (from the “1” in the tens place)
-
8 ones (from the “8” in the ones place)
✔ Answer:
18 = 1 ten and 8 ones
---
## 🧩 PART B: Split each number as tens and ones, and write them in the circles.
This uses a “number bond” or “part-part-whole” diagram.
1) Number: 16
- Break 16 into:
-
1 ten → because 10 + 6 = 16
-
6 ones
✔ Fill in:
- Left circle (ten):
1
- Right circle (ones):
6
---
2) Number: 13
- Break 13 into:
-
1 ten → because 10 + 3 = 13
-
3 ones
✔ Fill in:
- Left circle (ten):
1
- Right circle (ones):
3
---
## 🖼️ PART C: Write how many in all, how many tens, and how many ones.
1) Picture shows two plates with cupcakes:
- Left plate:
10 cupcakes → that’s
1 ten
- Right plate:
4 cupcakes → that’s
4 ones
- Total = 10 + 4 =
14
✔ Fill in table:
| Total | Ten | Ones |
|-------|-----|------|
|
14 |
1 |
4 |
---
2) Picture shows base-10 blocks:
- Left box:
10 blocks arranged as a full ten-frame →
1 ten
- Right box:
2 single blocks →
2 ones
- Total = 10 + 2 =
12
✔ Fill in table:
| Total | Ten | Ones |
|-------|-----|------|
|
12 |
1 |
2 |
---
##
✔ FINAL ANSWERS SUMMARY:
A)
1) 15 =
1 ten and
5 ones
2) 18 =
1 ten and
8 ones
B)
1) 16 → ten:
1, ones:
6
2) 13 → ten:
1, ones:
3
C)
1) Total:
14, Ten:
1, Ones:
4
2) Total:
12, Ten:
1, Ones:
2
---
## 💡 TEACHING TIP:
Decomposing numbers into tens and ones helps children understand
place value. It’s the building block for addition, subtraction, and later, multiplication. Using visual aids like pictures, base-10 blocks, or number bonds makes it concrete and easier to grasp!
Let me know if you’d like printable versions or more practice problems! 😊
Parent Tip: Review the logic above to help your child master the concept of kindergarten decomposing numbers worksheet.
