Decimal Dash
What is:
7.35 + 4.8
12.15
What is:
1/4 + 2/4
3/4
Question:
You have $25 and spend $8.75.
What operation should you use?
Subtraction
Question:
8.4 + 12.75 − 3.6
17.55
Question:
Chris buys 4.5 pounds of apples for $1.80 per pound.
How much does he spend?
$8.10
Question:
Without calculating exactly, which is greater?
5.8 × 4
or
5.8 + 4
5.8 × 4
What is:
15.6 − 8.47
7.13
What is:
5/6 − 1/3
1/2
Question:
A box contains 24 pencils. You have 7 boxes.
What operation should you use to determine the total number of pencils?
Multiplication
Question:
4.5 × 2.4
10.8
Question:
A notebook costs $8.35. You have $4.88.
How much more money do you need?
$3.47
Question:
A student says:
"When you divide by a fraction, the answer always gets smaller."
Is the student correct?
No.
Example:
4 ÷ 1/2 = 8
Dividing by a fraction less than 1 can make the answer larger.
What is:
4.25 × 3.6
15.3
What is:
2/3 × 3/4
1/2
Question:
You have 18.6 feet of rope and cut it into pieces that are each 3.1 feet long.
What operation should you use?
Division
Question:
7 1/2 ÷ 2 1/2
3
Question:
A car travels 39.2 miles per gallon. Another car travels 9.8 miles per gallon.
How many times as far does the first car travel?
4 times
Question:
Which is greater?
3/4 ÷ 1/2
or
3/4 × 1/2
3/4 ÷ 1/2 is greater.
What is:
45.36 ÷ 5.4
8.4
What is:
5/6 ÷ 2/3
1 1/4
Question:
A store sells notebooks for $2.75 each. You buy 4 notebooks and pay with a $20 bill.
What operations will you need?
Multiplication and subtraction
First:
2.75 × 4 = $11
Then:
20 − 11 = $9
Question:
3 1/4 + 2 2/3
5 11/12
Question:
A baker has 6 2/3 pounds of dough. Each loaf requires 2/3 pound.
How many complete loaves can the baker make?
10 loaves
Question:
A student has $50.
They spend $12.75 on a book and $8.50 on lunch.
Then they earn $15.25.
How much money do they have now?
$44
A student calculates:
6.25 × 3.4 = 21.25
Is the student correct? If not, give the correct answer.
Yes the student is correct
6.25 × 3 = 18.75
6.25 × 0.4 = 2.50
18.75 + 2.50 = 21.25
Question:
A recipe requires 2 1/2 cups of flour. You are making 3 batches.
How much flour do you need altogether?
Answer:
2 1/2 × 3 = 7 1/2 cups
Question:
A teacher has 6 3/4 gallons of paint. She uses 2 1/2 gallons and divides the remaining paint equally among 5 containers.
How much paint goes into each container?
Answer:
6 3/4 − 2 1/2
= 6 3/4 − 2 2/4
= 4 1/4
Then:
4 1/4 ÷ 5
= 17/4 ÷ 5
= 17/20 gallon
Answer: 17/20 gallon per container
Question:
Solve:
(12.5 − 3.75) ÷ 2.5
3.5
Question:
A rectangular garden has an area of 8 1/10 square feet and a width of 2 1/4 feet.
What is the length?
3 3/5 feet
A school is making trail mix.
Each batch requires:
The school makes 6 batches.
They have:
Do they have enough of every ingredient? If not, which ingredient runs out first?
Cereal:
1 1/2 × 6 = 9 cups
They have 10 → Enough
Pretzels:
3/4 × 6 = 4 1/2 cups
They have 5 → Enough
Raisins:
2/3 × 6 = 4 cups
They have 5 → Enough
Final Answer:
Yes, they have enough of all three ingredients.
They will have: