Repeated fractions
Today I can multiply a unit fraction by a whole number and say what each number means.
A Look back3 min
- 1.
2 + 2 + 2 + 2 + 2 =
- 2.
How many quarters make one whole?
- 3.
4 rows of 6 counters make counters altogether.
B Watch me, then you4 min
Ola cuts a cake into 5 equal slices. She eats one slice, then one more, then one more. How much cake has she eaten?
Each part is 1/5. Three parts are shaded.
1/5 + 1/5 + 1/5 = 3/5
So 3 × 1/5 = 3/5. The 3 counts the parts, and the 5 sets their size.
- 1.
2 × 1/6 = ? Circle the answer.
1/62/62/126/2
C Your turn6 min
- 1.
2 × 1/8 = ? Circle the answer.
1/82/83/82/2 - 2.
3 × 1/8 = ? Circle the answer.
2/83/84/83/24 - 3.
1/8 × 3 = ? Circle the answer.
3/81/243/38/3 - 4.
3 × 1/5 = ? Circle the answer.
3/51/53/155/3
Say it out loud: Which part of each row stayed the same, and which part changed? What did the change do to the answer?
D Spot the mistake3 min
- 1.
What is 3 × 1/4? Circle the answer.
3/123/41/43/3
E Think deeper3 min
Lena writes 4 × 1/7 and 1/7 × 4. She says they must be different answers because the numbers are swapped.
- 1.
Is Lena right? Explain what the 4 and the 1/7 each tell you.