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Guide and features
Guide and features
Science, Technology, Engineering and Mathematics
Featured Early Years Foundation Stage; US Kindergarten
Featured UK Key Stage 1&2; US Grades 1-4
Featured UK Key Stage 3-5; US Grades 5-12
Featured UK Key Stage 1, US Grade 1 & 2
Featured UK Key Stage 2; US Grade 3 & 4
Featured UK Key Stages 3 & 4; US Grade 5-10
Featured UK Key Stage 4 & 5; US Grade 11 & 12
Excel Interactive Resource: Long Multiplication
Stage: 3 and 4
Firstly here's the Excel file:
(Right-click on the link, "Save Target As", and select where you want the file to be saved.)
The increment buttons (scroll bars and spinner) change the numbers being multiplied or let you choose whether the result and working shows.
Here's the kind of challenge you might want to try:
First use the Excel file to check your ability to multiply two two-digit numbers.
Make up a few to test yourself.
Perhaps start with easier numbers using only the digits 2, 3, 4, or 5.
Then add a 9 or a 6 somewhere.
How about numbers using the digits 7 or 8?
Each time use the spreadsheet to check your working.
Can you make an answer that has the last digit as 2, or 6, or 7, but not using the digit 1 anywhere in the factors (the numbers you multiply together)?
Can you make the last two digits match the day in the month of your birthday?
Can you make an answer that has the digits getting larger in value from left to right (for example 1234 or 3569)? How about the other way around?
If someone else gives you one of the numbers to be multiplied can you always find another number to multiply with it so that the digits of the product are in ascending (or descending) order?
Invent some rules with a friend and challenge each other to find numbers that make a product which fits your rule.
Meet the team
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the
Millennium Mathematics Project