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90
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Explore this number:
List all the factors of 90.
Answer
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
List the first 5 multiples of 90.
Answer
90, 180, 270, 360, 450
Is 90 prime or composite? Explain.
Answer
Composite - it has 12 factors: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Write 90 as the sum of two numbers.
Answer
51 + 39 = 90
Write 90 as a product of two factors.
Answer
2 × 45 = 90
Write 90 as the difference of two numbers.
Answer
99 - 9 = 90
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