SME
Grade 4 Science · Problem type
Beats per minute from a 15-second count
Use this for “You count 18 beats in 15 seconds. How many beats per minute?”
Diagram
0, 18, 36, 54, 72
Beats in 15 seconds: 18
Beats in a minute: 72
This is an example. Type your own values to start a new problem.
Beats in 15 seconds
×
4
=
Beats in a minute
Formulas
18 × 4 = 72
Beats in 15 seconds × 4 = beats in a minute
Assumptions
•
The heart pumps blood to every part. Each pump is a beat you can feel at the wrist.
•
A minute has four 15-second parts. Count for 15 seconds, then multiply by 4.
•
The heart beats faster after running.
Step-by-step
WE KNOW
Beats in 15 seconds: 18
FIND
beats in a minute
Step 1 · Find beats in a minute
18 × 4 = ?
Beats in 15 seconds × 4 = beats in a minute
Four 15-second counts make a minute: multiply by 4.
Beats in a minute = 72
Check
Put the numbers back in. Both sides should match.
18 × 4 = 72 ✓
Topic check
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