Five pages on 10 more and 10 less, the 1st grade skill of changing the tens digit without counting by ones. On page 1 a number is shown in base-ten blocks: students write the number, then 10 less (one rod fewer) and 10 more (one rod more). Page 2 has nine pieces cut from a 120 chart, with one or two numbers given; going down a row is 10 more and going up a row is 10 less, so 45 has 35 above it and 55 below it. Page 3 asks for 10 more and 10 less in your head in two tables, with the last rows backward (10 more than what number is 39?), then shows a number changing, like 45 to 55 or 36 to 37, and students circle 1 more, 1 less, 10 more or 10 less. Page 4 counts on and back by tens from numbers that are not tens, such as 7, 17, 27, and 113, 103, 93. Page 5 prints a hundreds chart and eight arrow puzzles: an arrow down is 10 more, up is 10 less, right is 1 more and left is 1 less. Each page starts with a worked example.
Before page 1, build 34 with base-ten blocks and ask what changes when you add one rod (the tens digit) and what stays the same (the ones). Then do it on a hundreds chart: put a finger on 34 and move down one row. For page 3, say a number and have the class whisper 10 more and 10 less. The arrow puzzles on page 5 make a good partner game: one child writes a start number and arrows, the other follows them.
Ask quick questions in the car or at dinner: "What is 10 more than 46? What is 10 less than 81?" Count by tens from any number together (7, 17, 27, 37) and back down again. Counting dimes and pennies works too: one more dime is 10 cents more.
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 finding 10 more and 10 less than a number without counting by ones, up to 120. Count a number in base-ten blocks and write the numbers one rod less and one rod more. Fill in pieces cut from a 120 chart, where a step down is 10 more and a step up is 10 less. Find 10 more and 10 less in your head in two tables, then decide whether a number changed by 1 or by 10. Count on and back by tens from any number, and follow arrow puzzles on a hundreds chart. Every page comes in color and in black and white. Answer keys included.
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