Warm-up
Three quick questions from earlier lessons.
Discover
How many 0.5-liter bottles can be filled from 3 liters?
- 6
- 1.5
Key idea
Make the divisor a whole number.
To divide by a decimal, multiply both numbers by 10, 100, … until the divisor is whole: . Then divide; use long division and keep going after the point if needed. Dividing by a number less than 1 gives a larger result.
Worked example
.
× 10 both.
Divide.
Your turn, guided
Your turn: .
96 tenths ÷ 4.
Practice ★
- Compute .
- Compute .
- Compute .
Watch out!
Practice ★★
- How many 0.5-liter cups can be filled from 1.9 liters of juice? Compute .
- How many 0.4-liter cups can be filled from 8.2 liters of juice? Compute .
Exit ticket
Three questions to check you have got it.
- Compute .
- Compute .
- Compute .
Summary card
Dividing decimals
Scale both numbers to make the divisor whole.
Watch out: dividing by 0.something makes it bigger.