-20 and 80
-20*80=-1600
-20+80=60
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80+20 (and) 80*20(* means times)
1600 10% is equal to 0.1 and 1/10. You can either multiply by these numbers, or divide by 10 to find that 10% of 4000 is 400. 4000 - 400 = 1600
400
To find 40 percent of a number, multiply the number by 0.4. In this instance, 0.4 x 1600 = 640. Therefore, 40 percent of 1600 is equal to 640.
To find 4 percent of a number, multiply the number by 0.04. In this instance, 0.04 x 1600 = 64. Therefore, 4 percent of 1600 is equal to 64.