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Recall the doubles facts.
| 1 + 1 = 2 | 6 + 6 = 12 |
| 2 + 2 = 4 | 7 + 7 = 14 |
| 3 + 3 = 6 | 8 + 8 = 16 |
| 4 + 4 = 8 | 9 + 9 = 18 |
| 5 + 5 = 10 | 10 + 10 = 20 |
Let's find the numbers whose doubles can be used to add 4 and 5.
Add 4 and 5 using doubles plus one strategy.
4 + 5 = 4 + 4 + 1 = Double of 4 + 1 = 8 + 1 = 9
Now, let’s add 4 and 5 using doubles minus one strategy.
4 + 5 = 5 + 5 – 1 = Double of 5 – 1 = 10 – 1 = 9
So, doubles of 4 and 5 can be used to add 4 and 5.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21,27,23
21 is the smallest number.
