These addition grids enable children to understand the commutativity of addition as they find the sum of numbers at the top of each column and start of each row.

Pupils will find the sum to two numbers, one a multiple of 100 and one three-digit number. The worksheet begins with adding two numbers that are both multiples of one hundred and progresses to adding a multiple of one hundred to a number such as 445. There are 36 questions to answer in total.