How to work out the answer

This task is about thinking about how to find the answer for some maths problems.

Question 1Change answer

Work out the answers to each of the following problems and write them in the boxes.

a)  
i)  25 + 16 - 16 =
 
ii)  28 + 36 - 36 + 52 - 52 = 
 
iii) 62 + 74 - 62 = 
 
iv) 78 - 44 + 44 = 
 
v)  67 + 23 + 55 - 23 - 67 = 
b) Explain what you did to work out the answers. You can use one of the above problems to demonstrate what you did.