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In this factor rainbow for 100, each arch joins two factors whose product is 100. Only the left-hand factors are written. How many factors does 100 have in all?

Class 6Factors and MultiplesPlaying with Numbers
  • A5
  • B10
  • C4
  • D9

Step-by-Step Solution

4 arches give factors (1, 100, 2, 50, 4, 25, 5, 20), and 10 stands alone because . Total .
Answer: D) 9

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