Let’s solve each part step by step.
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Problem 9: Complete the subtraction sentences.
(a)
5 – 5 = ? → If you have 5 and take away all 5, you have 0 left.
→
0
5 – 4 = ? → Start at 5, count back 4: 4, 3, 2, 1 → ends at 1
→
1
5 – 3 = ? → Start at 5, count back 3: 4, 3, 2 → ends at 2
→
2
(b)
9 – 9 = ? → Take away all 9 from 9 → nothing left
→
0
9 – 8 = ? → Start at 9, go back 8 steps → lands on 1
→
1
9 – 7 = ? → Start at 9, go back 7: 8,7,6,5,4,3,2 → lands on 2
→
2
(c)
3 – 2 = ? → Start at 3, go back 2 → lands on 1
→
1
6 – 5 = ? → Start at 6, go back 5 → lands on 1
→
1
9 – 8 = ? → Same as above → lands on 1
→
1
(d)
6 – 4 = ? → Start at 6, go back 4: 5,4,3,2 → lands on 2
→
2
7 – 5 = ? → Start at 7, go back 5: 6,5,4,3,2 → lands on 2
→
2
8 – 6 = ? → Start at 8, go back 6: 7,6,5,4,3,2 → lands on 2
→
2
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Problem 10: Subtract 6 from 10.
It says: “6 and 4 make 10.” That means if you take away 6 from 10, what’s left is 4.
So:
10 – 6 =
4
(You can also check with dots: 10 total dots, cross out 6 pink ones — 4 yellow remain.)
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Problem 11: Complete the subtraction sentences.
(a) 10 – 3 = ?
Start at 10, go back 3: 9,8,7 → lands on 7
→
7
(b) 10 – 5 = ?
Half of 10 is 5 → so 10 – 5 = 5
→
5
(c) 10 – 8 = ?
Start at 10, go back 8: 9,8,7,6,5,4,3,2 → lands on 2
→
2
(d) 10 – 9 = ?
Take away almost all — only 1 left
→
1
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✔ All answers verified by counting backward or using number bonds.
Final Answer:
9.
(a) 0, 1, 2
(b) 0, 1, 2
(c) 1, 1, 1
(d) 2, 2, 2
10. 4
11.
(a) 7
(b) 5
(c) 2
(d) 1
Parent Tip: Review the logic above to help your child master the concept of singapore math 3rd grade.