Estimation
What should you do when you see the word ‘about’ in directions?
Estimate
How would you round 68x41?
70x40
What are the factors of 12?
1, 2, 3, 4, 6, 12
What are the first 5 multiples of 4?
4, 8, 12, 16, 20
True or false, 31 is a prime number
True
What word tells you if you need an exact answer or an estimate?
About
Round 2,657 to the nearest hundred.
2,700
Is 3 a common factor of 18 and 24?
Yes
What is the least common multiple of 6 and 8?
24
True or false, 45 is a composite number
True
What is the estimated quotient of 321 divided by 8
40
What is 43,293 rounded to the nearest hundred?
43,300
What are two common factors of 20?
1, 2, 4, 5, 10, or 20
What is the sum of the first two multiples of 6?
18
Are 3, 9, and 18 all composite numbers?
No
How would you estimate to check that your answer is reasonable in the problem 389x7=2,723
400x7=2,800
What is 225,298 rounded to the nearest hundred thousand?
200,000
What is the greatest common factor of 15 and 21?
3
What is the least common multiple of 7 and 9?
63
Is 70 a prime number?
No
Round each number to the nearest hundred. What is the estimate of 2,892+1,931
4,800
Rounding to the nearest hundred thousand, what is the sum of 481,327+225,298
700,000
What is the sum of all the factors of 21?
32
What is the sum of the first 6 multiples of 5?
105
What are two prime numbers between 32 and 48?
37, 41, 43, 47