Mystery Number: Multiples and Factors ACTIVITY NOTES

It displays the sum of the digits in the mystery number—in this case, 1 8 9. Explain that this button should be pressed for a hint ... 20, 21, 22, 24, and 25 are all multiples of numbers that are less than or equal to 12, so they can be crossed out. That leaves the prime numbers 13, 17, 19, and 23 as well as 1. ... [The number 24 has more ... ................
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