Video Transcript
There are five monsters. Each monster has six eyes. There are five groups of six eyes. Think about how we can find the total number of eyes. Help Anthony by writing an addition expression for the total number of eyes. Help Scarlett by writing a multiplication expression for the total number of eyes. How many eyes are there?
This model shows five monsters numbered in orange, who each have six eyes. There are many ways that we can calculate the number of eyes.
Anthony wants to use addition. One monster has six eyes. Two monsters have six plus six eyes. Five monsters have six plus six plus six plus six plus six eyes. There are five sixes that we need to add. Anthony’s addition expression is six plus six plus six plus six plus six. When Anthony added five sixes together, he was doing repeated addition. Repeated addition is a type of multiplication. It helps us find the total number of objects in equal groups.
Scarlett wants to write a multiplication expression to find the number of eyes. There are five monsters, with six eyes each. So, there are five groups of six. We write this as five multiplied by six or five times six. Scarlett’s expression is five times six.
The final part wants us to work out the total number of eyes. We do this by working out either the addition or the multiplication expression. We could do this by skip counting. Let’s skip count to find the total number of eyes: six, 12, 18, 24, 30. There are 30 eyes in total. Six plus six plus six plus six plus six equals 30, and this is the same as five lots of six or five times six.
In this question, there were five monsters with six eyes. When Anthony used addition, he found that the total number of eyes is six plus six plus six plus six plus six. When Scarlett used multiplication, she found that the total number of eyes is five times six. The total number of eyes is 30.
