lesson
Line up equal places
1 · Learn
In column addition, ones go under ones, tens under tens and hundreds under hundreds. Start by adding the ones.
If a column makes ten or more units, exchange ten of those units for one in the next column. Record the exchange so it is not forgotten.
2 · Worked example
For 247 + 135, write 2 ones and carry 1 ten. Eight tens and three hundreds give 382.
3 · Your turn
Use columns to calculate 368 + 254. Explain both exchanges.
Check your answer
622. Twelve ones become 2 ones and 1 ten. Twelve tens become 2 tens and 1 hundred. The hundreds total 6.
4 · Apply your learning
Check the result with expanded place values and compare it with an estimate of about 600.
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Use objects or a drawn model before relying on a rule. Explain each step, check the units and revisit with varied examples. An adult can read the instructions without supplying the answer.
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