Posted by Peter on 2nd October 2008

# Multiplying 2-digits by 2: moving towards standard written methods

Free maths worksheet from mathsblog.co.uk

Here is a worksheet which looks at multiplying a 2-digit number by 2. It uses a method taught in school prior to children using the standard written method, with which you are probably familiar.

This method of multiplication encourages understanding of the process of multiplying a 2-digit number by  a 1-digit number. The questions on this page would not normally be completed using written methods: mental methods should suffice. It would be expected that children could do these ‘in their heads’ from a  knowledge of doubling. However, carrying out the calculation with numbers that they are familiar with should help with understanding the method.

Also note, the Primary Framework for Mathematics does not recommend using these types of written method until Year 3 onwards (7/8 years old).

The method is to multiply the units first, then multiply the tens, finally adding the two together. It is a ‘half-way house’towards the standard written method, explaining what happens when the tens boundary is crossed during multiplying the units (ie when the units come to more than 10).

Multiplying 2-digits by 2; moving towards standard written methods