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The number on the very top of the drawing is the number that I am using and below it it their place solve the ones ten 100 and 1000. The one with the line in the middle is the four and six to see how many groups there are of 10 and it is 786.

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this is two division examples and the sum is 42 dived by 7 = 6

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This is when you take the first number and you add it tougher and the same with the end and then you joined it and you get your answer.

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The Inverse strategy is

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take away 2 from 17 and add it to 18 wich makes 20 and 17 is 15 teen this a way to make it more smiple