2x1 Multiplication with grid method

Topic guide

What this worksheet practises

This worksheet covers multiplying a two-digit number by a one-digit number using the grid method. The grid method breaks down multiplication by partitioning numbers into tens and units, making the calculation easier to manage.

Key method

To multiply using the grid method, follow these steps:

1. Partition the two-digit number into its tens and units.
2. Draw a grid with the partitioned number along the top and the one-digit number down the side.
3. Multiply the numbers that intersect in each box of the grid.
4. Add the values in the grid boxes together to find your final answer.

Worked example

Calculate 34 × 6

Step 1: Partition 34 into 30 and 4.

Step 2: Set up the grid and multiply.

• 30 × 6 = 180
• 4 × 6 = 24

Step 3: Add the results together.

180 + 24 = 204

The final answer is 204.

Common mistakes to avoid

A frequent error is miscalculating the multiples of ten. For example, when calculating 30 × 6, students might accidentally write 18 instead of 180. Always double-check that you have considered the place value correctly when dealing with tens.

How to check your answer

You can check your answer by using estimation. For 34 × 6, round 34 down to 30. We know that 30 × 6 = 180. Since 34 is slightly larger than 30, our answer should be slightly larger than 180, which means 204 is a reasonable answer.