Prime Factorization
This number has the prime factorization 2 × 2 × 5
20
What is the formula for the volume of a rectangular prism
length × width × height
5×16
80
Solve using doubling and halving:
16×25
16x25=
8x50=400
There are 48 cookies and 6 friends. If the cookies are shared equally, how many cookies does each friend get?
prime factorization of 36
2 × 2 × 3 × 3
Find the volume of a prism that is 3 cm long, 2 cm wide, and 4 cm high.
24 cm cubed
19×7
(20×7)−7=140−7= 133
Solve using partial products:
34×6
34 x 26 =
(30×6)+(4×6)=180+24= 204
There are 77 students going on a field trip. If each bus holds 15 students, how many buses are needed?
6 buses
prime factorization of 64
2 × 2 × 2 × 2 × 2 × 2
A rectangular prism has a volume of 60 cm³. Its height is 3 cm and its width is 4 cm. What is the length?
5 cm
8×5×5
200
Solve using partial products:
47×3
47×3=
(40×3)+(7×3)=120+21= 141
A teacher has 95 pencils to divide equally among 4 classrooms. How many pencils does each classroom get?
23 pencils per classroom with 3 pencils leftover
prime factorization of 90
2 × 3 × 3 × 5
Find the volume of a prism that is 8 cm long, 5 cm wide, and 3 cm high.
120 cubic centimeters
(5×4)×36
720
Solve using over/under strategy:
49×6
49x6=
(50×6)−(1×6)=300−6= 294
A pizza has 14 slices. 4 people share the pizza equally. How many slices does each person get?
3 full slices and 1/2 slice
prime factorization of 180
2 × 2 × 3 × 3 × 5
A rectangular prism has a volume of 180 cm³. Its length is 9cm and its width is 5cm. What is the height?
4 cm
(100×4)+(20×4)+(5×4)
500
A student solves 19×14 by doing:
(20×14)−(1×14)
Is this correct, and what’s the answer?
Yes, they are using the over/under strategy.
19×14=
(20×14)−(1×14)
280−14= 266
Maria has $45 that she wants to divide equally among her 4 friends to buy gifts. How much money will each friend get?
$11.25 each