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Adding Tens Crossing Hundreds
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Adding Tens Crossing Hundreds
Add tens to three-digit numbers. You can split the tens into smaller parts to cross a hundred. Show your thinking where asked.
Mental addition
1.Work out 268 + 40. First add to reach 300, then add more. The total is .
2.Work out 386 + 50 by splitting 50 into 20 and 30. What do you get after each jump, and what is the final total?
3.Calculate 457 + 70.
4.Calculate 196 + 80.
5.Calculate 348 + 60.
6.Calculate 579 + 40.
Check your understanding
7.Adding 30 to 482 changes the hundreds digit.
TrueFalse
8.When you add a whole number of tens, the ones digit stays the same.
TrueFalse
9.Is 697 + 20 equal to 717?
10.Which place-value columns change when you calculate 286 + 50? Choose every correct answer.
- Hundreds
- Tens
- Ones
11.Match each addition to its total.
- 275 + 40
- 468 + 60
- 189 + 30
- 592 + 50
- 642
- 219
- 326
- 315
Solve and explain
12.A box holds 278 toy bricks. Another 60 bricks are added. How many bricks are in the box now?
13.Explain how to work out 458 + 70 mentally. Use the words “partition”, “hundreds” and “tens”.
3 printable pages
Page 1
Page 2
Page 3
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