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Adding Tens Mentally
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Adding Tens Mentally
Adding 10, 20 or 30 keeps the ones digit the same. Count forward in tens, or add to the tens digit. Use each number line to show your jumps where one is provided.
Use a number line
Add the tens and write the total.
1.Start at 26. Make two jumps of 10. Where do you land? 26 + 20 = ____
2.Begin at 43 and jump forward three tens. What is 43 + 30?
3.What number is 10 more than 67?
4.Add two tens to 58. Write the total.
Add tens to three-digit numbers
Remember: the ones digit stays the same when you add whole tens.
5.Add 30 to 216. What is the total?
6.Work out 342 + 20.
7.Find the sum of 451 and 40.
8.Complete the calculation: 273 + 10 = .
9.Tomasz says that 324 + 30 = 354. Is she correct?
10.Which number is 20 more than 538?
- 540
- 548
- 558
- 738
11.Match each calculation with its answer.
- 124 + 20
- 275 + 30
- 361 + 40
- 482 + 10
- 401
- 305
- 492
- 144
Solve the problems
Read each situation and calculate the new total.
12.A box holds 37 stickers. Imogen puts 20 more stickers in the box. How many stickers are there now?
13.The school library has 146 storybooks on a trolley. A helper adds 30 more. How many storybooks are on the trolley now?
14.A farm collected 283 eggs in the morning and 40 more in the afternoon. How many eggs did it collect altogether?
15.When you add 30 to 217, which digit changes, and what is the answer?
4 printable pages
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