How do you count by sevens
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you use multiplication by sevens.
Well, honey, there are two sevens in 84. Math doesn't have to be complicated, just simple addition and subtraction. So, if you're looking for sevens, you've got a pair right there in 84.
7*9 is 63. You can count seven nines or nine sevens, or you can use a calculator.
in math counters are objects that help you count
7,17,27,37,47,57,67,70,71,72,73,74,75,76,77(two sevens),78,79,87,97=20 times