To solve this simple problem you have to know some things first. What do you need to know? Well, how many ounces in a pound, for starters. There are 16 dry ounces to the pound. Next you have to know what two tenths means. You can think of it as a decimal -- 0.2 -- or you can think of it as a standard fraction: 2/10, which reduced to 1/5. (Which means you have to know how to reduce.) Next you have to know what to do with those numbers. In this case, multiply the weight in pounds by the number of ounces in a pound: 0.2 pounds x 16 ounces per pound = 3.2 ounces. (Which means you have to know how to multiply decimals.) You could have done this, instead: (1/5) x 16 = 16/5 = 3.2.
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There are 160 ounces in ten pounds.
Ten and a half pounds equals 168 ounces.
To find 10% of ten pounds, convert the ten pounds to ounces (16 ounces per pound multiplied by ten equals 160 ounces). Multiply 160 by .1 and you get 16 ounces, or 1 pound.
10 ounces is equivalent to about 283.5 grams.
42 ounces = 2.625 pounds (2 5/8 pounds, or 2 pounds and 10 ounces) There are 16 avoirdupois ounces to a pound, so dividing 42/16 = 2.625 Removing the whole pounds leaves 42 - 32 = 10 which is 10/16 or 5/8 of a pound