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Three-Digit Addition and Subtraction
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Three-Digit Addition and Subtraction
Estimate where asked. Show your working for written calculations, including any regrouping.
Estimate and calculate mentally
1.Round 536 and 347 to the nearest hundred, then use your rounded numbers to estimate 536 + 347.
2.Round 761 and 286 to the nearest ten. Use these rounded values to estimate 761 − 286.
3.To estimate 648 + 273, which rounding choice is likely to give an estimate closer to the exact total?
- Round both numbers to the nearest ten.
- Round both numbers to the nearest hundred.
- Either choice always gives the same estimate.
Use written methods
4.Calculate 376 + 458 using a vertical column method. Show any regrouping.
5.Use a vertical column method to find 642 − 278. Show any regrouping.
6.Work out 587 + 296. Identify the columns in which you regroup.
7.Check 587 + 296 by rounding each number to the nearest hundred. What estimate do you get, and is the exact total reasonable?
Solve the problems
8.On a road trip, Arjun's family drove 368 km on Saturday and 457 km on Sunday. How far did they drive altogether?
9.A coach on a road trip had 732 passengers on board. At a stop, 286 passengers got off. How many passengers stayed on the coach?
10.During a road trip, Nathan paid $485 for fuel and $267 for accommodation. How much did he spend in total?
11.Isla's road-trip route is 918 km long. After travelling 459 km, how many kilometres are left?
12.In your own words, explain why regrouping may be needed when adding or subtracting three-digit numbers.
3 printable pages
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