Suppose we want to add 26 and 79

Stack the numbers one on top of another so that the ones digits line up in a column and the tens digits line up in another column.

Add column by column, starting from the ones column on the right. Continue reading Adding Large Numbers in Columns

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## Multiplying Larger Numbers

Suppose we want to multiply 57 by 13. First we multiply 57 by 3 to get 171 .

Next we multiply 57 by 1..

1 is in the tens column so it really means 10. We have to put a 0 directly under the 1 in 171.

Now we can multiply 57 by 1 to get 57.

To finish up, add the two products

So 57 multiplyed by 13 is 741. Continue reading Multiplying Larger Numbers

## Multiplying Large Numbers

Suppose we want to multiply 45 by 8. Start by stacking these numbers one on top of another with a line underneath. Multiply 8 by 5 . 8 by 5 is 40 so write down the 0 and carry the 4. Next, multiply 8 by 4. 8 by 4 is 32 . We need to add the 4 that we carried over, which makes the result 36. Because 8 and 4 are the last numbers to multiply, we write down the 36, we don’t have to carry. We find that 45 multiplied by 8 is 360. Continue reading Multiplying Large Numbers