Times the length
Today I can compare two lengths by saying how many times one length fits into the other.
A Look back3 min
- 1.
3 × 5 =
- 2.
The strip is cm long.
- 3.
7 × 10 =
B Watch me, then you4 min
A green ribbon is 15 cm long. A purple ribbon is 5 cm long. How many times the length of the purple ribbon is the green ribbon?
Three purple ribbons, each 5 cm, fit end to end.
5 cm × 3 = 15 cm.
So the green ribbon is 3 times the length of the purple ribbon.
- 1.
A red ribbon is 4 cm. A blue ribbon is 12 cm. The blue ribbon is times the length of the red ribbon.
C Your turn6 min
The short ribbon is always 4 cm. Only the long ribbon changes.
- 1.
The long ribbon is 8 cm. The short ribbon is 4 cm. The long ribbon is times the length of the short ribbon.
- 2.
The long ribbon is 12 cm. The short ribbon is 4 cm. The long ribbon is times the length of the short ribbon.
- 3.
The long ribbon is 16 cm. The short ribbon is 4 cm. The long ribbon is times the length of the short ribbon.
- 4.
The long ribbon is 20 cm. The short ribbon is 4 cm. The long ribbon is times the length of the short ribbon.
Say it out loud: What stayed the same in every row? What changed, and what happened to the answer?
D Spot the mistake3 min
- 1.
Kit's long rope is 12 cm and the short rope is 4 cm. How many times the length of the short rope is the long rope?
E Think deeper3 min
A ribbon is 4 cm long. Some lengths are a whole number of times that length. Find them.
- 1.
Write every length from 1 cm to 50 cm that is a whole number of times 4 cm, smallest first.