When we start to work with larger numbers, it helps to have some different strategies to use, including the area method, partitioning and long multiplication. Let's review a strategy with smaller numbers, so then we can use it with larger numbers.
Calculate 10\times 18 by completing an area model.
Firstly, complete the missing values in the area model.
Now add the values you found in part (a) to calculate 10\times 18.
If we are multiplying a number in the thousands, look out for some ways to make it easier, like we do in this video.
Find 2\times 869.
The area model is great, but we can also perform long multiplication. Let's see how they compare.
Find 739 \times 63.
The words and the context they're used in can give us clues to how we need to tackle a problem.
A rock climber descends from the top of a cliff face to the ground in 5 stages, dropping 106 metres each time.
What is the height of the cliff face?
Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers and make estimates for these computations
Continue and create sequences involving whole numbers, fractions and decimals. Describe the rule used to create the sequence