Question Video: Finding the Sum by Recognizing Another Way to Make the Same Number Mathematics • First Year of Primary School

Video Transcript

Find the missing number. Four plus one is five. Three plus two is what?

We know that four orange stars and one green star is five. The second picture shows three orange stars and two green stars. But we’re not told the total number of stars. Let’s put all of the stars together in a five frame. One, two, three orange stars and two green stars. How many stars are there in total?

Well, we don’t need to count them because the five frame is full. Three plus two is five. The missing number is five. Four and one is five, and three and two is five.