Five pages of strategies for subtracting two-digit numbers. Page 1 subtracts by place value when there are enough ones: tens from tens, ones from ones, then the two parts (68 - 25 is 40 + 3, 43). Page 2 shows the first number in base-ten blocks when there are not enough ones: students trade a ten for 10 ones (52 is 4 tens 12 ones) and cross out what they take away; the answer key crosses out whole rods, the loose ones and the cubes of the traded rod. Page 3 jumps back on an open number line, by tens and then the ones (73 - 28: 63, 53, 45). Page 4 counts up from the number taken away, to the next ten, then by tens, then the ones (62 - 47: 3 + 10 + 2 = 15), and checks by adding. Page 5 subtracts from 100 and from tens with a check, then shows two animals with different answers, one taking the smaller digit from the bigger or forgetting the ten it traded; students circle who is right and show how they know. Each page starts with a worked example.
Before page 2, build 52 with rods and cubes and ask a student to take away 7 ones. When they cannot, let the class decide what to do, then trade a rod for 10 cubes. Page 4 is the strategy children use for change: start at the price and count up to what you paid. Ask "Which way was easier, back or up?" after pages 3 and 4.
Count up for change: "This costs 47 cents and I pay 62. How much do I get back?" Count 47, 50, 60, 62 together and add the jumps. Ask your child to check every answer by adding it back.
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 2nd grade pack for subtracting two-digit numbers with place value strategies. Subtract the tens and the ones (68 - 25 = 40 + 3), then break a ten in base-ten blocks when there are not enough ones (52 is 4 tens 12 ones) and cross out. Jump back by tens and then the ones on an open number line, and count up from the number you take away (62 - 47: 3 + 10 + 2 = 15). Last, subtract from 100 and from tens, check by adding, and decide which animal is right. Every page comes in color and in black and white. Answer keys included.
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