A paper Is 2 metres long. I need 8 pieces of paper each 30 cm long. How many centimetres shorter is the paper than the length I need?
Answer
A piece of 30 cm, so for 8 pieces paper needed is 30 x 8 = 240 cm. But paper is 2 metre = 2 x 100 = 200 cm long. So paper is shorter by 240 – 200 = 40 cm
A string is 4 metres long. Can we cut it into 50 cm pieces and have nothing left over?
Answer
4 metres = 400 cm. We can cut it into 50 cm pieces. Since 400 is exactly divisible by 50. That is 400 is multiple of 50 400 + 50 = 8 We will get 8 pieces. Nothing is left over.