Math: Elementary School: Grades 3, 4 and 5 Quiz - Decimal Numbers 3 (Answers)
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Decimal numbers contain decimal points, on the left of which are units and on the right tenths, hundredths and thousandths. We use decimal numbers as an alternative to fractions to describe numbers that are smaller than a unit. For example, the fraction 1⁄8 could also be written as 0.125. Here we have 1 tenth, 2 hundredths and 5 thousandths. Decimal numbers make addition, subtraction, multiplication and division of fractions much easier. For this reason we have decimal measurements like meters and kilos which all use tenths, hundredths and thousandths.
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Remember - tenths, hundredths, thousandths
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2.089 is 2 units, 0 tenths, 8 hundredths and 9 thousandths
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Units are on the left of the decimal point
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The numbers are going up by 0.001, or 1⁄1,000 every time
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When we multiply by 10 the digits move one place to the left
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When we divide by 100 we move the digits two places to the right
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1⁄1,000 is less than 11⁄1,000, 1⁄100 or 1⁄10
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3⁄10 is larger than 3⁄100, 33⁄1,000 or 3⁄1,000
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There are 10 thousands in a hundredth so half of a hundredth is 5 thousandths
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Convert the cm into meters and you will have 1.23 + 0.63 giving 1.86m
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