Let’s solve each subtraction problem step by step. We’re subtracting numbers from 8, 9, or 10 — and none of these require borrowing (as the note says). That means we can just count back or use known facts.
We’ll go one by one:
(1) 9 – 3 = ?
Start at 9, count back 3: 8, 7, 6 →
6
(2) 9 – 4 = ?
9 → 8, 7, 6, 5 →
5
(3) 9 – 5 = ?
9 → 8, 7, 6, 5, 4 →
4
(4) 9 – 6 = ?
9 → 8, 7, 6, 5, 4, 3 →
3
(5) 9 – 7 = ?
9 → 8, 7, 6, 5, 4, 3, 2 →
2
(6) 9 – 8 = ?
9 → 8, 7, 6, 5, 4, 3, 2, 1 →
1
(7) 10 – 3 = ?
10 → 9, 8, 7 →
7
(8) 10 – 4 = ?
10 → 9, 8, 7, 6 →
6
(9) 10 – 5 = ?
10 → 9, 8, 7, 6, 5 →
5
(10) 10 – 6 = ?
10 → 9, 8, 7, 6, 5, 4 →
4
(11) 10 – 7 = ?
10 → 9, 8, 7, 6, 5, 4, 3 →
3
(12) 10 – 8 = ?
10 → 9, 8, 7, 6, 5, 4, 3, 2 →
2
(13) 8 – 5 = ?
8 → 7, 6, 5, 4, 3 →
3
(14) 8 – 6 = ?
8 → 7, 6, 5, 4, 3, 2 →
2
(15) 8 – 7 = ?
8 → 7, 6, 5, 4, 3, 2, 1 →
1
(16) 8 – 8 = ?
Same number minus itself →
0
(17) 10 – 8 = ?
Already did this in #12 →
2
(18) 8 – 8 = ?
Same as #16 →
0
(19) 9 – 8 = ?
Already did this in #6 →
1
(20) 10 – 8 = ?
Again, same as #12 and #17 →
2
✔ All answers checked. No mistakes found.
Final Answer:
(1) 6
(2) 5
(3) 4
(4) 3
(5) 2
(6) 1
(7) 7
(8) 6
(9) 5
(10) 4
(11) 3
(12) 2
(13) 3
(14) 2
(15) 1
(16) 0
(17) 2
(18) 0
(19) 1
(20) 2
Parent Tip: Review the logic above to help your child master the concept of kumon worksheets pdf.