Problem Solving

This morning Ls1 did problem solving. We were split into four different groups and had to solve 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 higligted the important words or numbers which is 119, and 48.

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

119 - 48 = ? Ones which is - 9 - 8 = 1

Tens which is - 10 - 40 is not possible so we have to add the 1 hundred to the ten, 110 - 40 = 70.

Last step is to put the answers togather so we can figure put the problem. 70 + 1 = 71, which means 71 millimetres of rain waterd the farm.

I think it was hard because I don't understand the written algorithm.