Subtraction worksheet for practicing subtracting tens, with answers and a fun salamander theme.

Let’s go through each subtraction problem step by step to make sure we get the right answers.

We are subtracting multiples of 10 (like 10, 20, 30... up to 100). That means we can think in terms of “tens” — for example, 20 is 2 tens, 50 is 5 tens, etc. So when we do 50 – 30, it’s like 5 tens minus 3 tens = 2 tens → which is 20.

Let’s check each one:

1) 20 – 10 → 2 tens – 1 ten = 1 ten → 10 ✔
2) 60 – 20 → 6 tens – 2 tens = 4 tens → 40 ✔
3) 40 – 10 → 4 tens – 1 ten = 3 tens → 30 ✔
4) 90 – 20 → 9 tens – 2 tens = 7 tens → 70 ✔
5) 50 – 30 → 5 tens – 3 tens = 2 tens → 20 ✔
6) 100 – 20 → 10 tens – 2 tens = 8 tens → 80 ✔
7) 70 – 40 → 7 tens – 4 tens = 3 tens → 30 ✔
8) 40 – 40 → 4 tens – 4 tens = 0 tens → 0 ✔
9) 30 – 20 → 3 tens – 2 tens = 1 ten → 10 ✔
10) 80 – 20 → 8 tens – 2 tens = 6 tens → 60 ✔

Now the second column:

11) 100 – 40 → 10 tens – 4 tens = 6 tens → 60 ✔
12) 60 – 60 → 6 tens – 6 tens = 0 → 0 ✔
13) 50 – 40 → 5 tens – 4 tens = 1 ten → 10 ✔
14) 70 – 30 → 7 tens – 3 tens = 4 tens → 40 ✔
15) 90 – 50 → 9 tens – 5 tens = 4 tens → 40 ✔
16) 60 – 30 → 6 tens – 3 tens = 3 tens → 30 ✔
17) 40 – 40 → same as #8 → 0 ✔
18) 100 – 50 → 10 tens – 5 tens = 5 tens → 50 ✔
19) 80 – 60 → 8 tens – 6 tens = 2 tens → 20 ✔
20) 90 – 70 → 9 tens – 7 tens = 2 tens → 20 ✔

Also, the question at the bottom:
“What happens when you subtract the same number from itself? Example: 60 – 60”
→ You always get 0, because anything minus itself equals zero.

All answers match what’s shown in red on the sheet. The worksheet is already solved correctly!

Final Answer:
All problems are correctly solved as shown:
1) 10
2) 40
3) 30
4) 70
5) 20
6) 80
7) 30
8) 0
9) 10
10) 60
11) 60
12) 0
13) 10
14) 40
15) 40
16) 30
17) 0
18) 50
19) 20
20) 20
And: When you subtract a number from itself, you always get 0.