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Use Break Apart to Solve:
27 x 9
243
Ursula has an album in which she keeps pressed flowers. The album has 34 pages, and each page has 7 pressed flowers. Which of the following shows a reasonable estimate of how many pressed flowers Ursula has
A 30 × 7 = 210
B 40 × 7 = 280
C 50 × 5 = 250
D 60 × 4 = 240
A 30 × 7 = 210
Estimate: 832 X 9
What is 7,200
Use Break Apart Strategy to Solve:
83 x 9
747
Isabelle has 9 ant farms. Each ant farm has 99 ants. Which of the following shows a reasonable estimate of how many ants Isabelle has?
A 7 × 125 = 875
B 8 × 110 = 880
C 9 × 100 = 900
D 10 × 100 = 1,000
C 9 × 100 = 900
Estimate: 166 X 6
What is 1,200?
Use Break Apart to Solve:
347 x 9
3,123
At an athletic club there are 11 people on a sports team. There are 8 teams. About how many people are on teams?
80 people
Estimate: 523 X 4
What is 2,000?
Use Break Apart Strategy to Solve:
938 x 6
5,628
Kenny has 7 pouches. Each pouch has 21 marbles. About how many marbles does Kenny have?
140 marbles
Estimate 5,000 X 7
What is 35,000?
Use Break Apart Strategy to Solve:
648 x 7
4,536
Every day for 1 week Derek’s cousin told him 11 jokes. Each joke took 3 minutes to tell. Derek thinks his cousin told him 33 minutes of jokes in the 1 week. Explain why this answer is not reasonable.
This answer is not reasonable because Derek's cousin told 11 jokes each day for a week. That means he told 77 jokes in 1 week. If each joke took him 3 minutes to tell, you would need to do 77 x 3 to find the answer, which is 231 minutes. Much higher than 33 minutes.