How to get the answers 50 to 70 only using the numbers 1,4,5,9

Question

And you can't put two numbers together. For example you can't put 1 an 4 together to make 14.

Answer 1

5 * 9 = 45, 45 + 4 + 1 = 50

(9 + 4 + 1) * 5 = 70

Sometimes, it can be easier to work backwards and see where that leads you. For example in the 70:

70 ÷ 5 = 14, and from there, 1 + 9 + 4 = 14.