Tell Time by Counting Back from a Five-Minute Mark
Tell Time by Counting Back from a Five-Minute Mark is a Grade 3 math skill from Eureka Math for reading clock times that fall between five-minute marks. When the minute hand is between two five-minute marks, find the next five-minute mark, then count back the individual minutes to where the hand actually points. The formula: Total minutes past the hour = (Minutes at next five-minute mark) - (Minutes counted back). For example, if the hand is 2 minutes before the 25-minute mark, total = 25 - 2 = 23 minutes past the hour.
Key Concepts
To find the total minutes past the hour, you can subtract the minutes you count back from the next five minute interval. $$(\text{Minutes at next number}) (\text{Minutes counted back}) = \text{Total minutes}$$.
Common Questions
How do you tell time when the minute hand is between five-minute marks?
Identify the next five-minute mark. Count back the individual minutes from that mark to where the hand actually points. Subtract: Minutes = (next mark) - (minutes counted back).
What is the formula for counting back from a five-minute mark?
(Minutes at next five-minute mark) - (Minutes counted back) = Total minutes past the hour.
Use this strategy to read a clock showing 4:23.
The next five-minute mark after 23 is 25. Count back 2 from 25: 25 - 2 = 23 minutes. The time is 4:23.
Why count back from the next mark rather than forward from the previous mark?
Both approaches give the same answer. Counting back from the next mark is useful when the hand is very close to the next mark, making it easier to see the small gap rather than count forward many minutes.
In which textbook is Tell Time by Counting Back from a Five-Minute Mark taught?
This skill is taught in Eureka Math, Grade 3.