Let’s solve each problem step by step. Remember:
- 10 tenths = 1 one → so if you have more than 9 tenths, convert the extra into ones.
- 1 tenth = 0.1
- Place values: hundreds, tens, ones, tenths — write them in order from left to right.
We’ll go one by one.
---
1) 7 TENS + 4 ONES + 3 TENTHS
→ 7 tens = 70
→ 4 ones = 4
→ 3 tenths = 0.3
Total = 70 + 4 + 0.3 =
74.3
---
2) 8 TENS + 1 ONE + 6 TENTHS
→ 80 + 1 + 0.6 =
81.6
---
3) 3 TENS + 7 ONES + 1 TENTH
→ 30 + 7 + 0.1 =
37.1
---
4) 6 HUNDREDS + 8 TENS + 2 TENTHS
→ 600 + 80 + 0.2 =
680.2
*(Note: no ones mentioned → that means 0 ones)*
---
5) 4 TENS + 9 TENTHS
→ 40 + 0.9 =
40.9
*(no ones → 0 ones)*
---
6) 8 HUNDREDS + 5 ONES + 4 TENTHS
→ 800 + 5 + 0.4 =
805.4
*(no tens → 0 tens)*
---
7) 5 ONES + 3 TENS + 8 TENTHS
Order doesn’t matter — add them up:
→ 30 (tens) + 5 (ones) + 0.8 (tenths) =
35.8
---
8) 6 TENTHS + 8 TENS + 3 ONES
→ 80 + 3 + 0.6 =
83.6
---
9) 7 HUNDREDS + 9 TENTHS + 4 ONES
→ 700 + 4 + 0.9 =
704.9
*(no tens → 0 tens)*
---
10) 6 ONES + 2 TENTHS + 4 TENS
→ 40 + 6 + 0.2 =
46.2
---
11) 12 TENS + 9 ONES + 5 TENTHS
First, convert 12 tens → 12 × 10 = 120
Then: 120 + 9 + 0.5 =
129.5
---
12) 4 TENS + 7 ONES + 1 TENTH
→ 40 + 7 + 0.1 =
47.1
---
13) 12 TENTHS
10 tenths = 1 one → so 12 tenths = 1 one and 2 tenths →
1.2
---
14) 8 ONES + 15 TENTHS
15 tenths = 1 one and 5 tenths → so total ones = 8 + 1 = 9, plus 0.5 →
9.5
---
15) 2 TENS + 7 ONES + 11 TENTHS
11 tenths = 1 one and 1 tenth → so ones become 7 + 1 = 8
Tens = 2 → 20
So: 20 + 8 + 0.1 =
28.1
---
16) 4 TENS + 9 ONES + 18 TENTHS
18 tenths = 1 one and 8 tenths → ones become 9 + 1 = 10
But 10 ones = 1 ten → so now tens = 4 + 1 = 5, ones = 0, tenths = 0.8
Wait — let’s do it step by step:
Start with:
4 tens = 40
9 ones = 9
18 tenths = 1.8
Add all: 40 + 9 + 1.8 = 50.8? Wait — 40+9=49, +1.8=50.8 → yes.
Alternatively:
18 tenths = 1 one + 8 tenths → so ones = 9 + 1 = 10 → which is 1 ten → so tens = 4 + 1 = 5, ones = 0, tenths = 0.8 → 50.8
✔ 50.8
---
17) 13 TENS + 7 ONES + 15 TENTHS
13 tens = 130
15 tenths = 1.5
So: 130 + 7 + 1.5 = 138.5
Or break down:
15 tenths = 1 one + 5 tenths → ones = 7 + 1 = 8
13 tens = 130
Total: 130 + 8 + 0.5 =
138.5
---
18) 15 TENS + 13 TENTHS
15 tens = 150
13 tenths = 1.3
Total: 150 + 1.3 =
151.3
Or: 13 tenths = 1 one + 3 tenths → so ones = 1, tenths = 0.3, tens = 15 → 150 + 1 + 0.3 = 151.3
---
19) 16 ONES + 14 TENTHS
14 tenths = 1 one + 4 tenths → ones = 16 + 1 = 17, tenths = 0.4 →
17.4
---
20) 8 HUNDREDS + 9 TENS + 4 ONES + 19 TENTHS
First, 19 tenths = 1 one + 9 tenths → so ones = 4 + 1 = 5
Now:
8 hundreds = 800
9 tens = 90
5 ones = 5
9 tenths = 0.9
Total: 800 + 90 = 890; +5 = 895; +0.9 =
895.9
---
Double-checking a few tricky ones:
#16: 4 tens (40) + 9 ones (9) + 18 tenths (1.8) → 40+9=49, +1.8=50.8
✔
#17: 13 tens (130) + 7 ones (7) + 15 tenths (1.5) → 130+7=137, +1.5=138.5
✔
#20: 800 + 90 + 4 + 1.9 = 895.9
✔ (since 19 tenths = 1.9)
All good.
──────────────────────────────────────
Final Answer:
1) 74.3
2) 81.6
3) 37.1
4) 680.2
5) 40.9
6) 805.4
7) 35.8
8) 83.6
9) 704.9
10) 46.2
11) 129.5
12) 47.1
13) 1.2
14) 9.5
15) 28.1
16) 50.8
17) 138.5
18) 151.3
19) 17.4
20) 895.9
Parent Tip: Review the logic above to help your child master the concept of reading decimals worksheet.
