Five pages on adding and subtracting decimals. Page 1 uses hundred grids: shade 0.3 and then 0.25 more to see 0.55, shade 0.7 and cross out 0.24 to see what is left, and write the equation a shaded grid shows. Page 2 rewrites problems in boxes with the decimal points in one column, so 3.4 + 1.25 becomes 3.40 + 1.25 and 6 − 2.37 becomes 6.00 − 2.37, then solves problems already in columns. Page 3 is money: total two price tags, finish two receipts with the change from a bill, find the change for a price, and decide whether a set or the parts bought apart is the better buy. Page 4 rounds to whole numbers to estimate before solving, checks whether answers are reasonable, and adds and subtracts to the thousandths. Page 5 has one-step and two-step story problems about distance, weight, length, and money.
Shade 0.4 on a hundred grid on the board and ask how many hundredths it is. Write 0.4 + 0.35 in columns twice, once lined up on the right and once on the decimal point, and ask which one adds tenths to tenths. On page 4, have students say their estimate before they solve, then compare the two.
Use a store receipt or a menu. Pick two or three things, add the prices, and ask how much change a $10 or $20 bill would bring back. Estimate first with whole dollars, then find the exact amount.
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.
A 5-page decimals pack for 4th and 5th grade. Add and subtract on hundred grids by shading and crossing out, then write problems in columns with the decimal points lined up, writing zeros in empty places (3.4 + 1.25, 6 − 2.37). Add price tags, finish receipts, find the change from a bill and the better buy, estimate with whole numbers before solving, add and subtract to the thousandths, and solve one- and two-step story problems. Every page comes in color and in black and white. Answer keys included.
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