Speaker: Lots of things come in multiples. You can look at multiplication as repeated addition. For example, these cans are in 5 rows of 3. Which you could think of as 5 times 3, or 3 + 3 + 3 + 3 ...

Watch the video to find out more. Speaker: Lots of things come in multiples. You can look at multiplication as repeated addition. For example, these cans are in 5 rows of 3. Which you could think ...

Ensign Electric Calculating Machine is a highly developed, electrically driven adding and subtracting machine, particularly ...