Let’s solve each problem one by one. We’ll line up the decimal points and add or subtract carefully.
---
1) 4.32 + 12.16
Line them up:
```
4.32
+12.16
------
16.48
```
✔ Answer: 16.48
---
2) 12.16 - 3.14
```
12.16
- 3.14
------
9.02
```
✔ Answer: 9.02
---
3) 46.30 - 03.67
Note: “03.67” is just 3.67
```
46.30
- 3.67
------
42.63
```
(We borrow: 30 - 67 → can’t do, so borrow from 6 → becomes 5, and 30 becomes 130? Wait — let’s do it properly.)
Actually:
Start from right:
0 - 7 → can’t do → borrow from 3 (tenths place). But 3 is in tenths, so we go to units.
Better way:
46.30
- 3.67
= ?
Think of it as:
46.30
- 3.67
———
Start from hundredths: 0 - 7 → borrow → 10 - 7 = 3, but now tenths digit was 3, becomes 2.
Tenths: 2 - 6 → can’t → borrow from units (6 becomes 5), tenths become 12 → 12 - 6 = 6
Units: 5 - 3 = 2
Tens: 4 - 0 = 4
Wait — that gives 42.63? Let me check with calculator logic:
46.30 - 3.67 = 42.63
✔
Yes.
✔ Answer: 42.63
---
4) 2.1 + 21.83
Write 2.1 as 2.10
```
2.10
+21.83
------
23.93
```
✔ Answer: 23.93
---
5) 1.89 + 5.91
```
1.89
+5.91
------
7.80 → which is 7.8
```
But usually we write 7.80 as 7.8 unless specified.
But since inputs have two decimals, keep two: 7.80
Actually, 1.89 + 5.91:
9+1=10 → carry 1
8+9+1=18 → carry 1
1+5+1=7 → so 7.80
✔ Answer: 7.80 (or 7.8 — both correct, but let’s keep two decimals for consistency)
---
6) 23.7 + 16.1
Write as 23.70 + 16.10? Or just:
23.7
+16.1
= 39.8
Because 7+1=8 tenths, 3+6=9 units, 2+1=3 tens → 39.8
✔ Answer: 39.8
---
7) 15.47 + 12.26
```
15.47
+12.26
------
27.73
```
7+6=13 → write 3, carry 1
4+2+1=7
5+2=7
1+1=2 → 27.73
✔ Answer: 27.73
---
8) 1.7 - 18.58
This will be negative because 1.7 < 18.58
So compute 18.58 - 1.7 = ?
18.58
- 1.70
= 16.88
So answer is
-16.88
✔ Answer: -16.88
---
9) 19.16 + 2.48
```
19.16
+ 2.48
------
21.64
```
6+8=14 → write 4, carry 1
1+4+1=6
9+2=11 → write 1, carry 1
1+0+1=2 → 21.64
✔ Answer: 21.64
---
10) 8.8 - 8.8
Any number minus itself is zero.
✔ Answer: 0.0 (or just 0 — but since decimals, maybe 0.0)
---
Now, compiling all answers:
Final Answer:
1) 16.48
2) 9.02
3) 42.63
4) 23.93
5) 7.80
6) 39.8
7) 27.73
8) -16.88
9) 21.64
10) 0.0
Parent Tip: Review the logic above to help your child master the concept of addition and subtraction decimals worksheets.
