Prime and Composite Numbers
Fill in the blank
The factors of 9 are 1, 3, and 9. The only composite factor is ___ because ____
9 because it has more than 2 factors
What is the quotient of the following expression? 73 divided by 20
3 R 13
What is the product of 1,900 x 20? Explain how you solved
38,000
Write the correct numerical expression and evaluate (solve) it.
a. The difference between 8 forty-sevens and 7 forty-sevens
b. triple the sum of 33 and some number
a. (8 x 47) - (7 x 47); 47
b. 3(33 + x)
Convert 4,567 grams to kilograms
Think: 1g = _____kg
Are we starting with a smaller or larger unit?
4.567 kg
List the factors of 12. Is it Prime or Composite?
Composite. 1, 2, 3, 4, 6, 12
Explain how to solve 291 divided by 30. What is 291 divided by 30
Label I's and O's, set up the problem, skip count by 3 and add a zero, continue using standard algorithm for division
9 R 21
Fill in the missing blanks to find the product.
6,000 x 50 = (6 x _____) x ( ___ x 10)
6,000 x 50 = (6 x 5) x (______)
6,000 x 50 = ______
1,000 x 5
10,000
300,000
Fill in the missing values in the blanks to find the product of 25 x 13.
25 x 13 = _______ twenty-fives
25 x 13 = (___ x 25) + (___ x 25)
25 x 13 = ____+ _____
25 x 13 = _______
13 twenty fives
25 x 13 = (10 x 25) + (3 x 25)
25 x 13 = 250 + 75
25 x 13 = 325
To practice for an Ironman competition, John swam 0.86 kilometer each day for 3 weeks.
How many meters did he swim in those 3 weeks? Explain your steps
18,060 meters
Is the number 1 prime or composite? How do you know
Prime. The only factor is 1/itself
What is the quotient of 1,056 divided by 37. Explain your steps to solve
Label I's and O's set up the problem, see how many times 37 can go into 1, 10, 105 and continue solving using standard algorithm
Explain how knowing 50 × 4 = 200 helps you find 500 × 400.
We can multiply the whole numbers, 5 and 4 to get 20 and add a zero at the end from the zero in the 50 that we started with.
Draw an area model that shows the correct partial products to solve 78 x 42?
break down 70 and 8 and 40 and 2
A truck weighs 1,675,280 grams. Convert the weight to kilograms.
1,675.280
Prime, more than 2
Estimate the quotient: 123.8 divided by 62
120 divided by 60
2
Round the factors and estimate the products
a. 656 x 106
b. 3,108 x 7,942
c. 8,633 x 57,008
a. 700 x 100 = 70,000
b. 3,000 x 8,000= 24,000,000
c. 9,000 x 57,000 = 540,000,000
Solve using standard algorithm
a. 263 x 42
b. 4.35 x 34
c. 6.13 x 14
a. 11,046
b. 147.9
c. 85.82
Convert milliliters to liters.
509 mL = ____ L
0.509 liters
List the factors of 29. Is it prime or composite?
Prime. 1 and 29
6.15 divided by 31
0.2
Write out the steps on how to estimate the product and solve for the answer. 891 x 52
Underline the largest place value, circle the helper number, and round using 5 or more/4 or less. Circle the whole numbers and underline your zeros. Multiply whole numbers and add your zeros at the end.
If the product of 485 × 35 is 16,975, what is the product of 485 × 3.5? How do you know?
1,697.5 because we started with 1 number after the decimal, so we have to end with 1 number after the decimal.
A small female gorilla weighs 68 kilograms.
How much does she weigh in grams?
68,000