We've looked at the order of operations in Maths in Order. We can now use this process to solve problems that may involve things like money, weight and distance.
Evaluate: A jug holds $0.75$0.75l of juice. If I have $3$3 jugs, how many $250$250ml glasses can I fill?
Think: I want both units of capacity to be the same, so I am going to convert $0.75$0.75l to $750$750ml by multiplying it by $1000$1000.
That means I can fill $9$9 glasses.
Evaluate: What is the difference between $187$187 and the product of $15$15 and $3$3?
Think: How do I write this as an equation so that the order of operations is correct?
There were $139$139 sharks in Charon Bay last year. This year the population has decreased to $92$92 sharks.
How much of the shark population in Charon Bay was lost in the last year?
I want to make $4$4 biscuits with $15$15 chocolate chips in each of them. How many chocolate chips do I need to use in total?
On a certain island a species of hawk sustains itself by eating the local rabbits.
In the first survey of animals on the island, there were found to be $3$3 rabbits for every hawk. The latest survey shows that this is still the case, but that the rabbit population has grown to $153$153 individuals. How many hawks does the island now support?
Use a range of multiplicative strategies when operating on whole numbers