Idea 19of 24Builds onThe area model for 23 × 14
Division finds a missing side
How is dividing like finding a side of a rectangle?
Today you'll discover
- what the area and the known side are
- how chunks build the missing side
- the names of the three numbers
Think firstArea 336, one side 14
A rectangle has an area of 336 and one side of 14. How long is the other side?
Decide first, then press Next. Look for the side that is missing.
A long rectangle with 14 beside its left edge, 336 inside it and a question mark over it. It fills with parts: 10 × 14 = 140, again 10 × 14 = 140, then 4 × 14 = 56, with 10, 10 and 4 over them. On the right, the column 336, minus 140, 196, minus 140, 56, minus 56, 0. Then 10 + 10 + 4 = 24 across the top. The last step shows 391 tiles and a side of 17.
See the whole ideathe big idea and the key word, in one place
The big idea
Division finds a missing side: the area divided by the side you know.
Compare themDividend: the total you divide (336). Divisor: what you divide by (14). Quotient: the answer (24).
Where it goes nextFloors, gardens and seating plans: when you know the total and one side, divide to find the other.
Key words
- dividend
- the number being divided: in 336 ÷ 14, it is 336
- divisor
- the number you divide by: in 336 ÷ 14, it is 14
- quotient
- the answer to a division: in 336 ÷ 14 = 24, it is 24
Ready to use it?
- Draw an area model for a division.
- Find a missing side from an area and one side.