Problem Solving

I completed a task called problem solving. The strategy we used to solve the problem was: Place value. The equation is: Leilani has already practised for 24 minutes, 26 minutes and 17 minutes.

First we started of with the ones by adding them all together. 4 + 6 + 7 = 10. Next we add them together 10 + 7 = 17.

Next we add the tens together which is 20 + 20 + 10 = 50. Next we add them together like this: 50 + 17 = 67.

Now we already know that she has already practised for 67 minutes. We can use subtraction to take away 67 from 90 like this.

0 - 7 is not possible so we take 1 ten from 90 and put it in 0 to make 10. So now its 10 - 7 = 3.

The next part is subtracting the tens so: 80 - 60 = 20. Now we add those answers together and it makes 23.

I enjoyed this task because it was quite hard because we had to subtract and add big numbers.