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primary 5 | Maths | Whole Numbers
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Aadit John
Aadit John

primary 5 chevron_right Maths chevron_right Whole Numbers chevron_right Singapore

Pls solve and explain

Date Posted: 3 years ago
Views: 325
Boy Mow Chau
Boy Mow Chau
3 years ago
1 roll -> 25 m = 2500 cm

2500 cm / 110 cm = 22 R80
this means from 1 roll of 25 m,
Jess can cut 22 pieces of 110 cm,
and there is 80 cm leftover that cannot be used.

200 / 22 = 9 1/11
to get 200 pieces, Jess needs 9 1/11 rolls,
but since you cannot buy 1/11 of a roll,
Jess needs to buy at least 10 rolls.

note that for this type of question, cannot take total length of ribbon required, divide by length in 1 roll, because there is some remainder in each roll that cannot be used.