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3 Cards in this Set

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  • Back

X increased by 20%. If the new number is 40, what is X?

Solution: 1+(20/100)= 1.2-> 40/1.2~33-> x= 33ish


How do you add two double digit numbers fast?

25+39=(24+40)=64

How do you subtract two double digit numbers fast?

65-19=(64-20)=44