Five pages on adding a two-digit and a one-digit number, the 1st grade step past facts within 20. Page 1 shows a number in base-ten blocks and a few more ones, where the ones stay under ten (32 + 5): students write the tens and ones and the sum. Page 2 makes a new ten: the tens are rods and the ones sit in a ten frame, and students draw the new dots to fill the frame first, then the rest in a second frame (38 + 5 is 4 tens 3 ones, 43). Page 3 breaks apart the second number to reach the next ten: 47 + 6 is 47 + 3 = 50, then 50 + 3 = 53. Page 4 does the same on a number line marked in ones: hop to the next ten, then hop the rest. Page 5 mixes both kinds and asks whether a new ten was made, then shows two animals with different answers (one adds the 5 to the tens, one forgets the new ten, one writes 213 for 33); students circle who is right and show how they know. Each page starts with a worked example.
Before page 2, build 38 with 3 rods and 8 cubes on a ten frame and add 5 cubes one at a time. Stop when the frame is full and ask what just happened (a new ten), then trade the full frame for a rod. For page 3, ask "How many more to get to the next ten?" before every problem. Page 5 makes a good talk: read the animals' answers aloud and let partners argue which one is right before they write.
Ask questions like "You have 47 stickers and get 6 more. How many now?" and ask how your child got the answer. Counting dimes and pennies works well: 3 dimes and 8 pennies, then 5 more pennies. Trade 10 pennies for a dime when you can.
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 1st grade pack for adding a one-digit number to a two-digit number within 100, with and without making a new ten. Count base-ten blocks to add when the ones stay under ten (32 + 5), then draw the new dots in ten frames to fill a new ten (38 + 5 = 43). Break apart the second number to make a ten (47 + 6: 47 + 3 = 50, 50 + 3 = 53) and hop to the next ten on a number line. Last, add and say whether you made a new ten, then decide which animal is right and show how you know. Every page comes in color and in black and white. Answer keys included.
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