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Features

Count ten rods to add and subtract tens (3 tens + 4 tens = 7 tens, so 30 + 40 = 70)
Use a fact you know: 4 + 3 = 7, so 40 + 30 = 70
Add tens to any number with base-ten blocks, counting on by tens from 34 to 44 to 54
Hop forward and back by tens on an open number line
Break a number into tens and ones to take tens away: 86 is 80 and 6, 80 − 30 = 50, and 50 + 6 = 56
Every page in color and in black and white
Answer keys included

Skills Covered

Add and subtract multiples of 10
Use a fact within 10 to add and subtract tens
Add tens to any two-digit number

Count on and back by tens on a number line
Break a number into tens and ones
Take away tens and keep the ones

How to Use This Pack

Five pages on adding and subtracting tens, the 1st grade step from facts within 10 to numbers within 100. Page 1 shows ten rods: 3 rods and 4 more rods, or 7 rods with 4 crossed out. Students write the tens (3 tens + 4 tens = 7 tens) and then the number sentence (30 + 40 = 70). Page 2 pairs a fact with its tens fact: 4 + 3 = 7, so 40 + 30 = 70. Then come twelve tens facts up to 100, three with a missing number. Page 3 adds tens to a number that is not a ten, like 34 + 20: students count on by tens in boxes (34, 44, 54) and write the sum. Page 4 hops by tens on an open number line, forward for adding and back for subtracting (78 − 30: 68, 58, 48). Page 5 takes tens away by breaking the first number apart: 86 is 80 and 6, 80 − 30 = 50, and 50 + 6 = 56, with blocks to cross out. Each page starts with a worked example.

In the Classroom

Before page 1, hold up 3 ten rods and then 4 more and ask how many tens there are, then how many ones that is. Say it both ways: 7 tens, 70. For page 2, write 5 + 2 = 7 on the board and ask what 50 + 20 must be, and why. On pages 3 and 4, count on by tens out loud from a number like 34, tapping a rod or a hop each time. For page 5, build 86 with blocks, take away 3 rods and ask what happened to the 6 ones (nothing).

At Home

Use dimes as tens: 3 dimes and 4 dimes are 7 dimes, or 70 cents. Ask quick questions like "What is 50 + 30?" and "What is 34 + 20?" Count on by tens from any number together: 26, 36, 46, 56. Then count back.

Tips for Success

30 + 40 is 3 tens + 4 tens: think 3 + 4 = 7, so 70
Adding tens changes the tens digit; the ones stay the same
Count on by tens from the first number: 34, 44, 54
Each hop on the number line is 10
To take away tens, break the number into tens and ones first

Common Core Standards Alignment

This pack supports the following Common Core State Standards for Mathematics:

1.NBT.C.4 Find sums up to 100 (two-digit plus one-digit, or plus a multiple of 10) with models and place value, making a new ten when needed.
1.NBT.C.5 Without counting, find the number 10 greater or 10 smaller than any two-digit number, doing it mentally and explaining why.
1.NBT.C.6 Subtract one multiple of 10 from another (between 10 and 90, answer zero or more), such as 70 - 40, using models or place value.
2.MD.B.6 Show whole numbers as distances from 0 on an evenly marked number line, and show sums and differences up to 100 as jumps on it.

Adding and Subtracting Tens

1st Grade

Adding and subtracting tens within 100, from ten rods to open number lines. Students use a fact they know (4 + 3 = 7, so 40 + 30 = 70), add tens to any number and break a number apart to take tens away.

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What’s Included

5 worksheets in color and in black and white, with answer keys (15 pages)
Add and subtract tens with ten rods, and tens facts from facts you know
Add tens to any number with blocks, and hop by tens on a number line
Break a number apart to take away tens

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Free to print and share

This worksheet is free to download, print, copy, and hand out in your classroom or at home. You do not need to create an account, and there are no watermarks on the PDF.