Prime and Composite Numbers
Is 29 a prime or a composite number
Prime
Complete the factor tree for 12
12
/ \
2 6
/ \
2 3
2 x 2 x 3
Using standard algorithm or the area model solve 125 x 0.1
12.5
Using standard algorithm or the area model solve 120 ÷ 0.1
1200
Sarah buys 5 notebooks that each cost $2.5. How much does she spend?
$12.50
What is the smallest composite number
4
Find the prime factors of 18
18
/ \
2 9
/ \
3 3
2 x 3 x 3
Using standard algorithm or the area model solve 342 x 0.2
68.4
Using standard algorithm or the area model solve 240 ÷ 0.2
1200
A runner jogs 3.2 km every day for 125 days. How far does she jog in total?
400 km
Is 24 a prime or composite number
Complete a factor tree for the number 40
40
/ \
5 8
/ \
2 4
/ \
2 2
2 x 2 x 2 x 5
Using standard algorithm or the area model solve 413 x 0.3
123.9
Using standard algorithm or the area model solve 362 ÷ 0.4
905
A box of markers costs $14.4. If each marker costs $1.2, how many markers are in the box?
12
What is the difference between a prime and composite number
Prime - only has two factors, one and itself
Composite - have more than two factors
Find the prime factors of 72
72
/ \
2 36
/ \
6 6
/ \ / \
2 3 2 3
2 x 2 x 2 x 3 x 3
Using standard algorithm or the area model solve 215 x 0.4
86.0
Using standard algorithm or the area model solve 450 ÷ 0.5
900
A factory produces 240 kg of flour in 0.3 hours. How much flour does it produce in one hour?
800 kg
Which numbers in this list are prime numbers
18, 23, 29, 35, 41
23, 29, 41
Create the factor tree for 126
126
/ \
2 63
/ \
7 9
/ \
3 3
2 x 7 x 3 x 3
Using standard algorithm or the area model solve 528 x 0.5
264.0
Using standard algorithm or the area model solve 672 ÷ 0.6
1120
A car travels 528 km using 0.6 liters of fuel per km. How many liters of fuel does it use?
880 km