Explanation Given information: The expression is 800 − 8.9 . Use the below steps to subtract: Write the second number below the first number as the decimal places are lined up. Now, place the subtraction sign on the left of the second number. Now, subtract as whole numbers. 800 − 8.9 _ Then, subtract the digits from the right to the left as whole numbers. Placing a zero to the right of the digits after the decimal in any number will not change any value. Now, insert the decimal and one zero to the right of 0 in the first number so that the digits can be lined up neatly. 800.0 − 8.9 _ Subtract the first place digits to the right of the decimal. Since 9 is larger than 0 , borrow 1 one from theonesplace. There is a 0 in the ones place, so borrow 1 ten from the tens place. Since there is another 0 in thetens place, borrow 1 hundred from the hundreds place and add it to 0 tens. 1 hundred = 10 tens . Split these 10 tens as 9 tens + 10 ones . 1 ten = 10 ones . Split these 10 ones as 9 ones + 10 tenths . Thus, in the hundreds place digit 8 becomes 8 − 1 = 7 , the tens place 0 becomes 0 + 10 − 1 = 9 , the ones place 0 becomes 0 + 10 − 1 = 9 and the tens place 0 becomes 0 + 10 = 10 . 8 7 0 9 0 9 . 0 10 − 8. 9 _ Now, subtract 9 from 10 , that is: 10 − 9 = 1 . 8 7 0 9 0 9 . 0 10 − 8. 9 _ 1 Now, place the decimal as in the other numbers. 8 7 0 9 0 9 . 0 10 − 8. 9 _ . 1 Now, subtract 8 from 9 , that is: 9 − 8 = 1

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ISBN: 9780321936875

Author: Elayn Martin-Gay

Publisher: PEARSON

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Chapter 4.3, Problem 34ES

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The subtraction of 800 − 8.9 and check it.

Solution Summary: The author explains how to subtract 800-8.9 from 791.1.

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