Math Drills

Multiplying and Dividing Decimals Review

L-3

Word Problems (Rounding)

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What this worksheet covers

Grade: Grade 4 (Elementary School)
Topic: Multiplying and Dividing Decimals

Decimal times whole number and decimal divided by whole number are handled in column form. The unit covers multiplication to one, two and three decimal places, division that leaves a remainder, division that adds zeros and carries on, division answered as a rounded figure such as 2 significant digits, and the order of operations with decimals.

The decimal point is the main stumbling block. In multiplication, children leave the point in the product where it sat in the number being multiplied. In division, the point in the quotient is not placed directly above the point in the dividend, so the answer comes out ten times or a tenth of the truth. Dropping the point in a remainder, writing 2.5 as 25, also persists.

The operations at work widen from addition and subtraction to multiplication and division of decimals. Lining up the decimal point, the foundation fixed in Adding and Subtracting Decimals, still applies exactly as it did there. Working out where the decimal point lands in a product or a quotient carries on into grade 5, when Multiplication of Decimals lets the multiplier itself be a decimal.

Division with Rounded Answers · To the Tenths Place (Word Problems)1 question
Division with Rounded Answers · To the Hundredths Place (Word Problems)1 question
Division with Rounded Answers · To 1 Significant Digit (Word Problems)1 question
Division with Rounded Answers · To 2 Significant Digits (Word Problems)1 question

Questions & answers

Problems and answers on this worksheet

These are the problems in “Multiplying and Dividing Decimals”, shown with their answers.

(1)For Christmas decorations, Lucas cuts 10m of ribbon into 7 equal parts. The length of 1 piece, rounded to the nearest 1/10 (the tenths place) to give an approximate number, is about how many m? Answer □
Answer: about1.4m
(2)At a bakery, Olivia splits 16kg of flour equally into 3 bags. When you find the amount in 1 bag by rounding to the 1/100 place as an approximate number, it is about how many kg? Answer □
Answer: about5.33kg
(3)On decoration duty, Mia divides 39m of ribbon equally among 7 committee members. If you find 1 person's share by rounding to 1 significant figure as an approximate number, about how many m is it? Answer □
Answer: about6m
(4)While making jump ropes, Henry divides rope 125m equally by length among 6 cousins. If you find 1 person's share by rounding to 2 significant figures to get an approximate number, about how many m is it? Answer □
Answer: about21m