6.NS.B3 Adding, Subtracting, Multiplying, and Dividing Multi-Digit Decimals
*When adding or subtracting, remember that you MUST line up the decimal points.
Example: 4.31 + 13.4 = OR
4.31
+ 13.40
___________
17.71
*When adding or subtracting, remember that you MUST line up the decimal points.
Example: 4.31 + 13.4 = OR
4.31
+ 13.40
___________
17.71
*When multiplying, you do not need to line up the decimal points. However, you must count the number of decimal spaces after the decimal in each number to determine where the decimal point goes in the product.
Example: 5.71 x 9.3
5.71 (2 decimal places after the decimal)
x 9.3 (1 decimal place after the decimal)
___________
1713
+ 51390
____________
53.103 (2 + 1 = 3, so count 3 decimal places)
*When dividing, you must move the decimal point in the divisor until it becomes a whole number. You must move the decimal point in the dividend the same number of decimal places.
Example:
Example: 5.71 x 9.3
5.71 (2 decimal places after the decimal)
x 9.3 (1 decimal place after the decimal)
___________
1713
+ 51390
____________
53.103 (2 + 1 = 3, so count 3 decimal places)
*When dividing, you must move the decimal point in the divisor until it becomes a whole number. You must move the decimal point in the dividend the same number of decimal places.
Example:
Long Division using the standard algorithm.
*Students enjoy using the acronym: Does McDonald's Sell Burgers Rare?
*Students enjoy using the acronym: Does McDonald's Sell Burgers Rare?