Problem Solving

 I completed a task called problem solving. We were split into four different groups and solved a problem using place value, rounding and compensating and written algorithm.

The problem we solved was: A farm received a total of 119 millimetres of rain over a 2 month period. If 48 millimetres of rain fell on the farm in June, how many millimetres of rain fell on the farm in month 2?

First we used place value to solve the problem. first we do the ones:

119 - 48 = ??

Ones - 9 - 8 = 1

Tens - 10 - 40 is not possible so we have to add the hundred to the ten.

110 - 40 = 70.

Last step is to combine the two answers. 70+1, So 71 millimetres fell on the farm on the second month.

It was hard because I was confused when we couldn't add in the tens columm.