Matthew Soon's answer to Sharif's Primary 5 Maths Whole Numbers Singapore question.
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If I gave you 2 beads, there will be an increase of 4 beads in the difference between our beads because I lose 2 and you gain 2.
Example:
I have 10, and you have 10.
I gave you 2 beads.
Now I have 8 and you have 12 (our difference is 4).
So if Gina has 30 more than Haina after giving 28 beads (which makes a difference of 2 x 28),
Gina originally had (30 + 2(28)) more beads than Haina, which is 86.
Example:
I have 10, and you have 10.
I gave you 2 beads.
Now I have 8 and you have 12 (our difference is 4).
So if Gina has 30 more than Haina after giving 28 beads (which makes a difference of 2 x 28),
Gina originally had (30 + 2(28)) more beads than Haina, which is 86.
Date Posted:
3 years ago
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