Lesson

Let's try this problem to practice reading a story problem and then writing the number sentence that we would use to solve it.

Dylan has 120 chocolates to give out to 10 guests at his birthday party and wants to make sure each guest gets the same amount.

Write a number sentence for this story problem to find how much each guest would get.

Worked Solution

Idea summary

If we know our total and want to find out how many groups we have, or how many are in each group, we need to divide.

We can use numbers, pictures and symbols to solve number problems. Let's see how we can solve multiplication and division in this video.

Sally and her mum were at home. Her grandma came around to visit, then her dad and brother came home together.

a

Which number sentence matches the number of people in the house?

A

2-1+2

B

2+1-2

C

2+1+2

D

1+1+2

Worked Solution

b

How many people are in the house altogether?

Worked Solution

Idea summary

Mathematical problems can be represented with words, pictures and symbols.

Sometimes we need more than one step to solve a number problem, so it helps to look at how to work through each step.

Charlie has 50 cm of ribbon, which he cuts into 10 equal pieces.

He then selects one of these pieces, and cuts 2 cm off it.

How long is this piece of ribbon now?

Worked Solution

Idea summary

If our problem has equal groups and we need to find a total, we use multiplication.

If we have to share our total into equal groups, we use division.

uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers

uses mental and informal written strategies for multiplication and division