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Study in the app →Mathematics · Year 3 · Chapter 1
The 2s, 5s and 10s
Practice
- 2 × 5
- 10
- 2 × 8
- 16
- 2 × 9
- 18
- 5 × 4
- 20
- 5 × 7
- 35
- 5 × 9
- 45
- 10 × 6
- 60
- 10 × 9
- 90
- 7 × 1
- 7 — one group of 7 is just 7
- 6 × 0
- 0 — zero groups means nothing there
Easy questions
- 2 × 3
- 6
- 5 × 2
- 10
- 10 × 4
- 40
- 2 × 6
- 12
- 5 × 5
- 25
Medium questions
- 5 × 8
- 40
- 2 × 9
- 18
- 10 × 7
- 70
- 5 × 6
- 30
- 2 × 7
- 14
Hard questions
- 5 × 9 + 5
- 50 — that's ten fives
- Which is bigger: 2 × 8 or 5 × 3?
- 2 × 8 = 16 beats 15
- 10 × 6 − 10
- 50 — six tens minus one ten is five tens
- 4 × 5 (hint: turn it around)
- 20 — same as 5 × 4
- 0 × 10
- 0 — zero groups of ten
Lesson
Multiplying is counting groups
2 × 5 means five groups of two — it counts GROUPS, all the same size. That's why skip counting is the on-ramp: 2, 4, 6, 8, 10 is the 2s table said out loud. The 5s land on 5 and 0, the 10s just put a zero on. Two facts trip almost everyone at first. Seven times ONE is seven — one group of 7 is just the 7, nothing was added (that '×1 means +1' feeling is addition sneaking in where it doesn't belong). And anything times ZERO is zero — zero groups of six lollies is no lollies at all. Multiplying doesn't 'do something' to a number; it says how many groups of it you have.
- 5 bags × 2 lollies: 2, 4, 6, 8, 10 — ten lollies.
- 5 × 7 = 35 — seven fives: 5, 10, 15, 20, 25, 30, 35.
- 7 × 1 = 7. One group of seven. (7 + 1 = 8 is a different question.)
- 6 × 0 = 0. Zero groups — there's nothing to count.
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