Add It Up!
136 + 252
388
64 + 42 + 88
194
738 - 523
215
To add 546 + 327, would you need to regroup? Explain.
Yes; 7 + 6 = 13, which is 1 ten and 3 ones.
Suppose a bus travels 276 miles on Monday and 248 miles on Tuesday. How many miles does the bus travel?
524 miles.
678 + 129
807
354 + 85 + 72
511
455 - 182
273
Round to the nearest hundred to check the work. Is the answer reasonable? Explain
421 – 179 = 358
No, the estimate is 200. The real correct answer is 242, so 358 is not reasonable.
Emma had 462 beads. She used 289 of them to make bracelets. How many beads does she have left?
173 beads.
538 + 429
967
307 + 37 + 234
578
574 - 86
488
Check the subtraction answer by adding. Is it correct?
824 – 465 = 358
No, 358 + 465 = 823
Liam collected 215 stamps. His friend gave him 187 more. Then he bought 96 at a flea market. How many stamps does Liam have now?
498 stamps.
415 + 298
713
32 + 9 + 56 + 8
105
609 - 453
156
When subtracting 3-digit differences, when do you know when to regroup or borrow?
If the number of ones or tens I need to subtract is greater than the number of ones or tens I have.
Jada spends $74 on a hat, shoes, and shorts. If the hat costs $22 and the shoes cost $33, how much were the shorts?
$19
1,118 + 1,335
2,453
246 + 54 + 233 + 205
738
709 - 453
256
Theo says that 560 - 137 is 437. Is he correct and why?
No; you cannot take 0 away from 7. Bottom, bigger, borrow.
A pet store has 162 goldfish, 124 angelfish, and 7 bowls with 8 pufferfish in each. How many fish are there in all?
342 fish.