When multiplying any number by 10, 100, 1000 (basically any #1 followed by zeros) just count the number of zeros. The number of zeros present is how many spots the decimal moves to the left.
For example
3.5 X 10 = 35
24.5 X 100 = 2450
So the answer would be
2.45 X 10 = 24.5
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x+y=245 x=0-245 y=0-245
35x + 115 = 360 35x = 360-115 35x = 245 x = 245/35 x = 7
2 x 245 = 490
x/35 = 7 x = 7 * 35 x = 245
transitive property