Multiplying and dividing by two digits; divisibility · Usually met around P4
Two-digit × 11
Split the digits, put their sum between.
How to do it
Method
Split the digits, put their sum between
35 × 11: 3 + 5 = 8 → 385
Another way
Column multiplication
35 × 11 = 350 + 35 = 385
In full
Split the two digits apart and put their sum in the middle. 35 × 11 → 3 _ 5, with 3+5=8 in the middle → 385. If the middle makes ten or more, carry: 78 × 11 → 7 _ 8, and the middle is 15. Write the 5 and carry 1: 7+1=8 → 858. You can also multiply in columns (35 × 11 → 350 + 35 = 385).
Worked examples
Have a go first, then open each one for the answer and the working.
Example 1
54 × 11
Show the answer and working
Answer: 54 × 11 = 594
54 × 11: split 5 and 4, put 5 + 4 = 9 in between → 594
Example 2
45 × 11
Show the answer and working
Answer: 45 × 11 = 495
45 × 11: split 4 and 5, put 4 + 5 = 9 in between → 495
Example 3
53 × 11
Show the answer and working
Answer: 53 × 11 = 583
53 × 11: split 5 and 3, put 5 + 3 = 8 in between → 583
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