MONEY MATH
A movie theater buys 20 popcorns at $4.50 each.
How much do they spend?
90 dollars
What is 6 × 0.4?
2.4
How many feet are in 4 yards?
Hint: 1 yard = 3 feet
4 yards = 12 feet
Why does multiplying by 0.1 move the decimal to the left?
Because multiplying by 0.1 is the same as dividing by 10.
Write 1,000 using exponents.
10³
A school buys 18 notebooks for $2.75 each.
What is the total cost?
$49.50
What is 12 × 0.5?
6
Convert 10 yards to feet.
10 yards = 30 feet
Why should you estimate before solving a word problem?
To check if the answer is reasonable.
Write 10,000 using exponents.
10⁴
A team buys 24 shirts for $8.25 each and 24 hats for $3.50 each.
How much do they spend in all?
Shirts: $198.00
Hats: $84.00
Total: $282.00 (final Answer)
What is 18 × 0.75?
13.5
A project uses 15 yards of rope.
How many feet is that ?
45 feet
Why must units match before solving a problem?
Because you cannot combine or compare different units.
A factory makes 1,000 times more chairs a day then the store which makes 20 items.
Write an expression using exponents to solve
20 × 10³
A fundraiser buys 35 pizzas for $6.40 each and 50 drinks for $1.20 each.
What is the total cost?
Pizzas: $224.00
Drinks: $60.00
Total: $284.00 (final answer)
What is 64 × 0.25?
16
Each bracelet uses 0.5 yards of string.
How many feet is that for one bracelet?
1.5 feet
Why does multiplying by 0.25 make a number smaller?
Example: 20 x 0.25 = 1
Because 0.25 is less than 1.
A company makes 100 times more sofas everyday compared to a store, which makes 20 sofas a day.
Write the expression to solve and write 100 using exponents.
20 x 10²
40 items at about $7 each and 30 items at about $1.50 each.
Is the total closer to $300 or $400? Explain.
40 x 7 = $280
1.50 rounds to 2 so --> (30 x 2 = $60)
280 + 60 = $340
340 rounds to $300
Final answer $300
A student buys 9 items that cost $0.80 each.
What is the total cost?
$7.20
A student uses 0.75 yards per project.
How many feet is that per project?
2.25 feet
Why is it important to line up decimals when adding money?
So place values match correctly.
Each item uses 0.4 meters of material.
A factory makes 1,000 times as many items.
Write an expression that shows how much material is needed.
Do not solve.
0.4 × 10³