به انگلیسی

Stretching the Times Tables

ریاضی · تفکر ریاضی · سن ۷ تا ۸ سال

نام ______________________ تاریخ ____________

Ella knows 6 × 5 = 30 and 6 × 2 = 12. Use her facts to find 6 × 7.
پاسخ: ______________
All multiples of 4 are even. Which number could be a multiple of 4?
- 15
- 22
- 28
- 31
4 × 9 = 36. Is 36 an odd number or an even number?
- Odd
- Even
- Neither
In the pattern 10, 20, 30, 40, the rule is 'add 10 each time'.
دور یکی دایره کشیدن: درست نادرست
A growing pattern starts at 30 and adds 50 each time. What is the third number in the pattern?
پاسخ: ______________
A pattern goes 3, 6, 9, 12. What rule describes it?
- Add 3 each time
- Add 4 each time
- Multiply by 3 each time
A pattern grows by adding 50 each time: 120, 170, 220. What comes next?
- 270
- 230
- 260
- 320
Ava describes a pattern as add 60 each time: 40, 100, 160. Is Ava right?
دور یکی دایره کشیدن: درست نادرست
Sam wants 9 × 7. He writes: 9 × 7 = 9 × 5 + 9 × 3 = 45 + 27 = 72. What went wrong?
- 9 × 3 should be 24, not 27
- Nothing is wrong
- 5 + 3 = 8, not 7, so the split is wrong
Use the pattern: 7 × 5 = 35. Since 7 × 9 is four more sevens than 7 × 5, what is 7 × 9?
پاسخ: ______________

پاسخ‌نامه

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42 · 7 is 5 + 2, so 6 × 7 = 30 + 12 = 42.
28 · 28 is even and 28 = 4 x 7, while the odd choices cannot be multiples of 4.
Even · Every multiple of 4 is even, so 36 has to be even.
درست · Each number is 10 more than the one before it, so the rule is add 10.
130 · Start 30, then 80, then 130.
Add 3 each time · Each number is 3 more than the last one, so the rule is add 3.
270 · Adding 50 to 220 gives 270.
درست · Ava is right. 40 + 60 = 100 and 100 + 60 = 160, matching her rule.
5 + 3 = 8, not 7, so the split is wrong · 5 and 3 add up to 8, not 7. That split actually gives 9 × 8. The correct split is 9 × 5 + 9 × 2 = 45 + 18 = 63.
63 · Four more sevens add 28 to 35, so 7 × 9 = 35 + 28 = 63.