complete the sentence then write down what you notice

ercise 1.2 Commutative law Complete the sentences then write down what you noticed a) 23 x 4 = 4 x 23 = b) 30 * 3 = 3 * 30 = C) 5+6= - 6 + 5= d) 11 + 10 = 10 + 11 = e) 12+ 13 +3 = _ 13 + 3 + 12 = f) 7+8 +16 = 8 + 16 +7 = Complete the following sums (you do not have to work out