Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
Primary 4 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
How do I do it in a way my Maths teacher can understand? She said cannot do the long method.
I know 2nd day is add 10, 3rd day add 20, 4th day add 30, 5th day add 40. Altogether is 100 but I don’t know how to draw model or write in number sentence.... can someone please help me?
See 1 Answer
85 ÷ 5 = 17
Ans: 17 pages
For second day, draw one box and one smaller box. Label the inside of the smaller box as '10'
For third day, draw one box and 2 smaller boxes. Label the inside of each smaller box as '10'
For fourth day, draw one box and 3 smaller boxes. Label the inside of each smaller box as '10'
For the fifth day, do the same but with 4 smaller boxes.
Here's a symbol representation :
Day 1 ⬛
Day 2 ⬛[10]
Day 3 ⬛[10][10]
Day 4 ⬛[10][10][10]
Day 5 ⬛[10][10][10][10]
The black box represents the number of pages read on the first day.
The total for 5 days is 185 pages.
Steps/working :
① There are 10 boxes of 10 pages. Their total = 10 x 10 pages = 100 pages
② So sum of 5 black boxes
= 185 - 100
= 85 pages
③ Since each black box has the same value, divide 85 by 5 to find each box's value.
85 pages ÷ 5 = 17 pages
So number of pages read on the first day
= 17