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MF.NS.5 Standard MF-005-A07-V02

Find factors, multiples, common factors, and common multiples to solve numerical and contextual problems.

Use common multiples in repeating schedules

Problem

At \(9:00~a.m.\), two school bells ring together. One bell rings every \(12~\text{minutes}\), and the other rings every \(18~\text{minutes}\). What is the first time after \(9:00~a.m.\) when both bells will ring together again?

Parallel number lines for two school bells starting together at 9:00 a.m. The top row shows a bell ringing every 12 minutes at 0, 12, 24, 36, 48, and 60 minutes after 9:00. The bottom row shows a bell ringing every 18 minutes at 0, 18, 36, and 54 minutes after 9:00. Open full size
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Four variants of this problem type
Curriculum context
Standard
MF.NS.5
Category
Number Sense
Domain
Whole-Number Structure
Objective
Find factors, multiples, common factors, and common multiples to solve numerical and contextual problems.
Problem type
Use common multiples in repeating schedules