Nine times Here are 10 sets of 5. How many cubes is that?

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How many sets of 5 are there?
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Presentation transcript:

Nine times Here are 10 sets of 5. How many cubes is that?

Nine times I know! 10 x 5 = 50.

So how would I change this to get 9 x 5? Nine times So how would I change this to get 9 x 5?

Nine times Take off one set of 5. So 9 x 5 = 45.

Nine times Here are 10 sets of 7. How many cubes is that?

Nine times I know! 10 x 7 = 70.

So how would I change this to get 9 x 7 ? Nine times So how would I change this to get 9 x 7 ?

Nine times Take off one set of 7. So 9 x 7 = 63.

There is a pattern in the answers we have found. What do you notice? Nine times There is a pattern in the answers we have found. What do you notice? 2 x 9 = 18 3 x 9 = 27 6 x 9 = 54 8 x 9 = 72

Nine times 2 x 9 = 18 3 x 9 = 27 The ‘how many nines’ number is always one more than the tens digit of the answer. 6 x 9 = 54 8 x 9 = 72

Nine times Give an example. 2 x 9 = 18 3 x 9 = 27 6 x 9 = 54 8 x 9 = 72

6 x 9 has an answer in the fifties. Nine times 2 x 9 = 18 3 x 9 = 27 6 x 9 has an answer in the fifties. 6 x 9 = 54 8 x 9 = 72

Nine times What else do you notice? 2 x 9 = 18 3 x 9 = 27 6 x 9 = 54 8 x 9 = 72

The digits in each answer add to 9. Nine times 2 x 9 = 18 3 x 9 = 27 The digits in each answer add to 9. 6 x 9 = 54 8 x 9 = 72

Nine times Give an example. 2 x 9 = 18 3 x 9 = 27 6 x 9 = 54 8 x 9 = 72

Nine times 2 x 9 = 18 3 x 9 = 27 2 + 7 = 9. 6 x 9 = 54 8 x 9 = 72