Grid method of multiplication explained
The grid method is a way of teaching multiplication that is used in primary schools. Pupils move on from an array to the grid method. It is also used for teaching times tables.
You need an empty number square.
To calculate 35 × 7, set it out in a grid like this:
Multiply each pair of numbers and write them in the grid. Then add the two products (ie answers to the multiplications) to find the answer.
The grid method can also be used for more difficult multiplications, such as 35 x 26.
If children are not familiar enough with their times tables to complete the grid in this way, the numbers can be broken down further eg 35 can be broken into 10, 10, 10, 5; 26 can be broken into 10, 10, 6.
A multiplication grid up to the 10 times table can be used as a ready reckoner. It is also useful for investigating patterns in numbers.
Methods such as this are important for helping children understand that calculations can be built up to reach a total and set out in different ways.
It helps to develop their understanding of more complex calculations and it's also a stage in progression towards long multiplication.