Topic 7/8/9 Review

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What is the order of operations in mathematics?

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The order of operations is a set of rules that determines the sequence in which calculations are performed. The common acronym is PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

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CCSS.7.NS.A.3

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CCSS.6.NS.B.3

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How do you multiply decimals?

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To multiply decimals, multiply the numbers as if they were whole numbers, then count the total number of decimal places in both numbers and place the decimal point in the product accordingly.

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CCSS.6.NS.B.3

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CCSS.6.NS.B.3

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Back

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CCSS.6.NS.B.3

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CCSS.6.NS.B.3

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What does it mean to divide a number by 1?

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Dividing a number by 1 does not change its value; the result is the same number.

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CCSS.3.OA.B.5

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What is the significance of parentheses in mathematical expressions?

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Parentheses indicate which operations should be performed first in an expression, following the order of operations.

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CCSS.6.EE.A.2C

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What is a decimal?

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A decimal is a fraction expressed in a special form, where the denominator is a power of ten, represented with a decimal point.

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How do you subtract decimals?

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To subtract decimals, align the numbers by the decimal point and subtract as you would with whole numbers, placing the decimal point in the answer.

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CCSS.5.NBT.B.7