Whichever numbers you chose to multiply first, you will always have a large 2-digit number multiplied by a 1-digit number. Let’s solve 8 x 9 first. 8 x 9 = 72 Now let’s work out 72 x 7 using ...

For example, if you're multiplying 25 by 11, add the two and five together to get seven, and place the seven between those ...

Image caption, Representing the array as a grid can be helpful when dealing with large integer ... highlights 4 multiplication and division facts. Partition the numbers into tens and units.

Although not required for basic addition, Excel has the SUM function, which can simplify adding large ranges ... If you need ...