Maths Revision⭐📱💯

For maths, we have maths revision! Here are my explanations of these problems, please correct me if I am wrong!

Tom had 36 boxes of oranges. Each box has 7 oranges in it. How many oranges does he have altogether.

36 x 7 =

30 x 7 = 210 + 6 x 7 = 42 = (210 + 42 = 252)

Susan makes 1 litre of juice with ⅕ of a Raro sachet. She needed to make 17 litres of juice. How many sachets does she need?

⅕ = 1L. 1 = 5L. 3=15L because 3 whole pkts = 15L(⅕ = 1L). 3 ⅖ sachets is needed.

Daniel walked 3.7 kilometres on Sunday and another 2.9 kilometres on Monday. How many kilometres did he walk?

3.7 + 2.9 = 6.6. 3 + 2 = 5, .7 + .9 = 1.6. 5 + 1.6 = 6.6

Joseph had 672 songs on his ipod then deleted some. He now has 388 songs left. How many songs did he delete?

672 - 388 = 284

600 - 300 = 300

72 - 88 (take 100 from the 300 to make 172 - 88) =84

200 + 84 = 284

Catarina took $58 dollars from her bank account. She now has $387. How much did she have in the beginning?

58 + 287 = 345

290 + 50 = 340 (58 - 3 because of the rounding 3)

340 + 5 = 345

Sina threw 40 shots in a basketball game. She got 20% of the shots in . How many did she get in the hoop?

8

8/40 = 2/10 = 20%/100. Which makes the answer 8!

There were 25 students in the Glenbrae school bus. That is only ¼ of the school. How many students are in the school?

25 x 4 = 100

Containers arrived at the wharf with 1500 kilograms of sugar. Pak n Save bought ⅕ of the sugar. How much did Pak n Save buy?

300g

⅕ of 1500 kg = 300g

300g x 5 = 1500 kg

I ironed 5 shirts in 30 minutes. How long will it take me to iron 15 shirts?

5 shirts = 30mins

15 shirts = 90 (because 5 x 3 = 15 & 30 x 90)

On a hot day the temperature outside is 17 degrees. On a cold day it drops by 5 degrees. What is the temperature on a cold day?

12 degrees

17 - 5 = 12

How many matchsticks do you need for the fifth picture?

What is the pattern?

18

6 = 1, 9 = 2, 12 = 3, 15 = 4, 18 = 5 (in threes)

If 120 X 2 is 240. How can you work out 120 X 4?

240 x 2 = 480

Double it because 2 and 4 have a shared relation of double or two.

Simon had 5 pizzas. He shared them with 2 other friends. How much does each of them get?

They each have 1 ⅔ of pizza. 5 pizza’s, one goes to each friend and him and the other two can be split into thirds.

A painter uses 3/7 of a tub of paint on one wall. How many does he need for 18 walls?

3/7 = 1 wall

3/7 x 18 = 54/7 = 7 5/7 tubs of paint for 18 walls.
A race car uses 23 litres in one lap. How many litres does it need for 3.5 laps?

23 x 3 = 69

½ of 23L = 11.5

69 + 11.5 = 80.5L