Question Video: Solving Word Problems Involving Addition and Subtraction of Rational Numbers Mathematics • Second Year of Primary School

Video Transcript

A shop had 67 tins of soft drinks. If 55 of them were sold, how many tins are left?

The shop started with 67 tins. As 55 of them were sold, we need to subtract 55 from 67. One way of doing this is using column subtraction. Subtracting five from seven in the ones or units column gives us two. In the tens column, we have six minus five, which is equal to one. 67 minus 55 is equal to 12. This means that the shop has 12 tins of soft drinks left.

An alternative method here would be to use a number line. We need to subtract 55 from 67. If we begin by subtracting 50, we get to 17. Subtracting another five takes us down to 12. This means that 67 minus 55 is indeed 12.