Not many questions on this page but an impressive number of maths concepts needed to answer the questions correctly. These include:
Understanding that addition can be done in any order so: 50 + 15 = 15 + 50
Understanding that 45 – 31 is different from 31 – 45
Understanding that addition reverses subtraction, ie addition is the inverse of subtraction
Understanding that division reverses multiplication, ie division is the inverse of multiplication
Understanding that 16 ÷ 8 does not equal 8 ÷ 16
Begin to understand the commutative law (although not the term)
Example of the commutative law: 24 x 12 = 12 x 24
If a child has cracked all these ideas they are well on the way to success.
Understand relationships between addition, subtraction, multiplication and division