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23 August, 04:38

Could you use the double fact to find the sum for 4+5? Choose yes or no 4+4=8 Yes or no 5+5=10 yes or no 9+9=18 yes or no

+1
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  1. 23 August, 05:02
    0
    Yes. You can use 4+4=8

    and then add 1

    8+1=9

    since 5 = 4+1 we add the 1 at the end
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