lesson
Multiply the tens and ones
1 · Learn
Split a two-digit number into tens and ones, multiply both parts and add the results.
For 23 × 4, four groups of twenty make 80 and four groups of three make 12. Together they make 92. A short written method records the same place-value reasoning.
2 · Worked example
In short multiplication, 3 × 4 gives 12: record 2 ones and exchange 1 ten. Then 2 tens × 4 plus the exchanged ten gives 9 tens.
3 · Your turn
Calculate 34 × 3 and explain the parts.
Check your answer
102. Thirty times three is 90 and four times three is 12; 90 + 12 = 102.
4 · Apply your learning
Draw three bars split into 30 and 4. Connect your drawing to the written method.
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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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