Math: Elementary School: Grades 3, 4 and 5 Quiz - Multiplication and Division 4 (Answers)
This Math quiz is called 'Multiplication and Division 4' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is an enjoyable way to learn if you are in the 3rd, 4th or 5th grade - aged 8 to 11.
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Multiplication and division (specifically) use remainders. Remainders are parts of a number that are left over. As an example, I have 4 cats and 10 cat treats. I can only give each cat 2 treats each, which means I will have 2 treats left over. The 2 left can't be divided by 4 as it is below 4, therefore the 2 is a 'remainder'. Remainders can be converted into fractions and decimals like so:
10 ÷ 4 = 2 r2 or 2.25 or 21⁄4
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Work out the calculations in brackets first
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An eighth of a number is the same as saying divide it by 8
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0.25 is the decimal equivalent of 1⁄4
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72 x 10 = 720; half of 720 = 360, so 720 + 360 = 1,080
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Just as 0.25 is 1⁄4
of 1, 25 is 1⁄4
of 100
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e.g. 1⁄12 of 66. One third is 22, half of 22 is 11, half of 11 is 5.5
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Multiplying by 100 is much easier than multiplying by 99
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You can use this strategy for other numbers over 100, for example to multiply a number by 107 multiply by 100 and also by 7 then add the 2 results together
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To multiply a number by 10 move its decimal point 1 place to the right
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To multiply a number by 100 move its decimal point 2 places to the right
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