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:
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Adding and subtracting decimals on hundred grids and in columns, with the decimal points lined up. Students add prices and make change, estimate first, work to the thousandths and solve one- and two-step story problems.
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