Maths Mate Sheet 1 Question 23 (Term 4 2014)
Prediction: I predict this problem will be about predicting or estimating.
Read: I think of a number , subtract 5 and then divide it be 3. If the result is 6, what was the original number?
Clarification: None needed.
The Big Question: What was the original number?
Mathematician’s Toolbox: Work backwards/Have I seen a similar problem?
Solving: First I worked backwards from 6. I used multiplication because division is multiplication backwards. So I did 6 times 3 which is 18. After that I added 5 because subtraction is the inverse operation of addition. So I added 5 and I got the result of 23.
Conclusion: So the answer was 23.