Idea 11of 22Builds onThe mean: level the stacks
Add, then divide by how many
How do you find the mean without moving blocks?
Today you'll discover
- the two steps of the mean
- what you divide by
Think firstApples picked: 3, 5, 4, 8, 5
What is the mean number of apples picked?
Decide first, then press Next. Read the two lines of working.
Five stacks of apples: 3, 5, 4, 8 and 5. Then the stacks stand level at 5 under two lines of working: total 3 + 5 + 4 + 8 + 5 = 25, and shared equally 25 ÷ 5 friends = 5 each. Then the levelling, with pieces from the 8 filling the 3 and the 4. The last step shows laps swum on five days.
See the whole ideathe big idea and the key word, in one place
The big idea
Mean = total ÷ how many values. Add them all, then share equally.
Two steps1. Add every value to get the total. 2. Divide the total by how many values there are. The answer is the mean.
Easy to get wrongThe total is not the mean. 25 apples is what all five picked together; the mean is one friend's equal share, 5.
Key word
- total
- all the values added together
Ready to use it?
- Find a mean by adding and dividing.