SME
Grade 1 Science · Problem type
Sound makes things move
Use this for “Which hit made more rice jump? How many more?”
Picture
14
5
More grains, loud hit: 9
This is an example. Type the numbers from your problem to start.
Grains, loud hit
example
Grains, soft hit
example
More grains, loud hit
answer
Number sentences
14 − 5 = 9
Good to know
•
Put rice on a drum. Hit the drum and the rice jumps.
•
A hard hit makes the drum vibrate more. The sound is louder, and more rice jumps.
•
Count the grains that jumped off.
Step-by-step
WE KNOW
Grains, loud hit: 14
Grains, soft hit: 5
FIND
more grains, loud hit
Step 1 · Find more grains, loud hit
14 − 5 = ?
Count on from the smaller number to the bigger one. That is how much more.
14 is more than 5 (the loud hit)
Count on from 5: 6, 7, 8, 9, 10, 11, 12, 13, 14 → 9
More grains, loud hit: 9
Check
Put the numbers back in. Both sides should match.
14 − 5 = 9 ✓
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