Five pages on dividing decimals, every answer ending at the hundredths. Page 1 shares base-ten blocks, a flat as one whole: 3.42 ÷ 3 gives each group a flat, a rod and 4 small squares once the extra rod is traded for 10 small squares. Then students shade a hundred grid and split it into equal groups, a color for each. Page 2 is long division by a one-digit number: estimate first (17.36 ÷ 4 is about 16 ÷ 4 = 4), divide, and put the point in the quotient straight above the point in the dividend; then the digits of each quotient are given and an estimate decides where the point goes. Page 3 divides by two-digit numbers, including whole numbers that need a point and zeros written after them (54 ÷ 24 = 2.25), and checks whether someone put the point in the right place. Page 4 divides by a decimal: jumps of 0.3 on tenths strips show 2.4 ÷ 0.3 = 8, and 1.5 ÷ 0.05 is 150 hundredths ÷ 5 hundredths = 30; then times 0.1 is divided by 10, and divided by 0.01 is times 100. Page 5 has money and measurement stories, one and two steps, with an estimate first, and a table of deals where students find what one costs and circle the better buy. Every page starts with a worked example.
Share real base-ten blocks before page 1: give a group 3 flats, 4 rods and 2 small squares to share among 3, and ask what to do with the rod that is left. On page 2, have students estimate on whiteboards before they divide, then compare the estimate with the quotient. Before page 4, draw three tenths strips on the board and hop along them in jumps of 0.3.
At the store, compare two sizes of the same thing: a 4-pack for $3.80 or a 6-pack for $5.10. Divide to find what one costs in each, estimate first, and decide together which is the better buy.
This pack supports the following Common Core State Standards for Mathematics:
© Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
Dividing decimals to the hundredths, from sharing base-ten blocks and hundred grids to long division and dividing by tenths and hundredths. Students estimate first, place the decimal point, write zeros to keep dividing, and solve money and measurement stories, including which deal is the better buy.
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