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Pre-Algebra
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What is 5 times 20?
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Isn't it easier to just type that in to a calculator than ask here? :P
Anyway, forget the zero for a while, multiply 2 and five, then stick the zero back on ;)
20x5 +100
100
count by 20 five times then add 100
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100
20+20+20+20+20=100
100
100
If you have problems with multiplying by tens, try this: Instead of 5X20, do 5X2 which =10. Then add the "0" we took away from the 20 and add it to 10, so now we have 100. You could do the same thing to bigger #'s too! 5X2000 5X200=1000 (add the 0 we lost) 10000
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100 :)
100
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