Understand why the order of addition and subtraction steps can be chosen | Maths

Starter quiz

How can Izzy reorder this equation so it has the same value? 45 + 30 = 75
- 75 − 45 = 30 ✓
- 45 = 75 − 30 ✓
- 35 + 40 = 75
- 30 = 75 − 45 ✓
The equation 20 + 18 = 38 has been reordered in different ways. Match up the parts of the equations to make them correct.
- 20 =
  
  ⇔
  
  38 − 18 ✓
- 18 =
  
  ⇔
  
  38 − 20 ✓
- 38 =
  
  ⇔
  
  18 + 20 ✓
Find the missing part. 42 + $\square$ = 62
- '20' ✓
What is the missing number? $\square$ = 50 + 14
- '64' ✓
What is 12 + 4 + 4? = ______
- '20' ✓
Izzy and Lucas are collecting conkers. Izzy has 14 conkers and Lucas has 8 conkers. They find another 6 conkers. How many do they have altogether?
- '28' ✓