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Simple question on times tables tests for 3s.
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", "advice": "If a number has a factor of 3 then so does the sum of the digits. This can help make by making a number smaller, for instance 12 has 1+2=3 as the sum of its digits and hence 12 has a factor of 3. Similarly 96 has sum of digits 9+6=15 and 1+5=6 which has a factor of 3 so 96 has a factor of 3.
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