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sorry forgot to say if you divide it by ten it is the same as counting in tens

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it might not be clear

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When you have your sum you put the equal sign then braces with 9 x 40
then plus 9 x 2  in braces then put the equal sign and that equals 360 then plus 18 and then put the equal and that equals 378

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bridge to decades

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so first you you draw a line lets say three then the six in the middle you put the to three plus six then you do the same for the five and two so the answer is seven then put a line for the seven and the nine and in the middle is your answer if need more help look at picture