Question Video: Subtracting Three-Digit Numbers by Counting Back in Hundreds on a Number Line Mathematics • Second Year of Primary School

Video Transcript

Count back in hundreds to find the difference. 429 subtract 300 equals what.

In this question, we have to subtract 300 from 429. And the question tells us to use the number line to count back in hundreds. So we need to start at the number 429, and we need to count back in hundreds three times because we’re subtracting 300. 100 less than 429 is 329. The hundreds digit has decreased by one because we’ve taken away 100. 100 less than 329 is 229. So far, we’ve subtracted 200. Let’s subtract our final 100. 100 less than 229 is 129. 429 subtract 300 equals 129. We counted back in hundreds to find the difference.