Math: Elementary School: Grades 3, 4 and 5 Quiz - Decimal Numbers 1 (Answers)
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Decimal numbers are numbers that are not whole. 3, 7, 9 and 10 are whole numbers. 3.4, 7.1, 9.2 and 10.3 are decimal numbers. Can you spot the difference? The decimal numbers have a 'dot' which is called a decimal point. Adding and subtracting decimal numbers is just like doing it with whole numbers, for example 11 + 12 = 23 and 1.1 + 1.2 = 2.3. Decimal numbers can also be changed into the whole number they are closest to. We call this rounding up or down. For example, 4.7 would be rounded up to 5 but 4.4 would be rounded down to 4.
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Tenths are the column after the decimal point
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A number 7 in the tenths column means 7⁄10
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Whole numbers are on the left of the decimal point
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We round down numbers less than .5 and we round up numbers equal to or higher than .5
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Just like 43 + 4 = 47,
4.3 + 0.4 = 4.7 |
Just like 8 - 6 = 2
0.8 - 0.6 = 0.2 |
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3⁄10 is less than 9⁄10
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All the other numbers have less than 4 units
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There are 100 pence in £1 so we divide 345 by 100 which gives 3.45 or £3 and 45p
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There are 100cm in a meter. Therefore 423cm is 4m and 23cm or 4.23m
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