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Study in the app →Mathematics · Year 2 · Chapter 1
Adding by making ten
Practice
- 8 + 2
- 10
- 9 + 1
- 10
- 7 + 3
- 10
- 6 + 4
- 10
- 5 + 5
- 10
- 8 + 5
- 13 — (8 + 2) then + 3
- 9 + 4
- 13 — (9 + 1) then + 3
- 7 + 6
- 13 — (7 + 3) then + 3
- 8 + 7
- 15 — (8 + 2) then + 5
- 9 + 6
- 15 — (9 + 1) then + 5
Easy questions
- 8 + 2
- 10
- 9 + 1
- 10
- 7 + 3
- 10
- 6 + 4
- 10
- 10 + 5
- 15
Medium questions
- 8 + 5
- 13 — bridge: (8+2)+3
- 9 + 4
- 13
- 7 + 6
- 13 — (7+3)+3
- 9 + 7
- 16
- 8 + 6
- 14
Hard questions
- 8 + 5 + 2
- 15 — pair the 8 and 2 first: 10 + 5
- 17 + 6
- 23 — (17+3)+3
- 9 + 8
- 17 — (9+1)+7
- 25 + 7
- 32 — (25+5)+2
- Why bridge through ten instead of counting on?
- Because adding onto a ten is automatic — the digits just sit next to each other
Lesson
Bridge through ten
Adding onto ten is easy: 10 + 3 is just 13 — the digits do the work. So the trick for sums like 8 + 5 is to go THROUGH ten. Ask: what does 8 need to become 10? Two. Take that 2 from the 5, leaving 3. Now it's 10 + 3 = 13. One clean hop instead of five wobbly steps. This is called bridging ten, and it needs exactly one thing to be automatic: the pairs that make ten (8+2, 9+1, 7+3, 6+4, 5+5). That's why the practice deck drills them — once the bonds are instant, every awkward sum near ten turns into an easy one.
- 8 + 5 → 8 needs 2 → (8 + 2) + 3 → 10 + 3 = 13.
- 9 + 6 → 9 needs 1 → (9 + 1) + 5 → 10 + 5 = 15.
- 7 + 4 → 7 needs 3 → (7 + 3) + 1 → 10 + 1 = 11.
- It works past ten too: 18 + 5 → (18 + 2) + 3 = 23.
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