Grade 7 Mathematics · M7-N1-L2Lesson preview
Prime and composite numbers
Is 91 prime? Test 2, 3 and 5. Do we stop there?
- Step 1. 91 is odd, its digit sum is 10, and it ends in 1. So 2, 3 and 5 all fail.
Outcome M7-N1-L2 · Open lesson library
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