Common multiples

Problem: During the summer months, one ice cream truck visits Jeannette’s neighborhood every 4 days and another ice cream truck visits her neighborhood every 5 days. If both trucks visited today, when is the next time both trucks will visit on the same day?

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Fist I look at the tens look at                                          Round 52,845 :                     the units and if its over five I round up and if                                                    its below five then I have to  keep the  tens                                                                        the same.

a) the nearest 10: (52,850)

b) the nearest 100: (52,000)

c) the nearest 1,000:(52,900)

Round 71,458:

a)the nearest 10:(71,460)

b) the nearest 100: (71,500)

c) the nearest 1,000:(72,000)