multiplication and division
an elephant can eat as much as 330 pounds of food per day. How much food would it eat in two weeks?
4,620
2.756 + 8.97
11.726
4 + (3.5 * 2) - (1.2 + 0.3)
10.5
89
Prime
Divide 89 by the numbers starting from 2 up to 10 and check if there is any remainder.
89 ÷ 2 = 44 remainder 1 89 ÷ 3 = 29 remainder 2 ... 89 ÷ 10 = 8 remainder 9
If there is no number that divides 89 evenly and leaves no remainder other than 1 and 89 itself, then 89 is a prime number.
From the calculations above, we see that 89 is not divisible evenly by any number other than 1 and 89 itself. Therefore, 89 is a prime number.
Your family owns a house and pays $2,500 each year to the local government. What type of tax is this?
Property Tax
3.75 x 2.32
8.70
13 - 2.75
10.25
3 * ((14 / 7) + 2.1) - (5 - 2)
9.3
7
Prime
Divide 7 by the numbers starting from 2 up to 3 and check if there is any remainder.
7 ÷ 2 = 3 remainder 1 7 ÷ 3 = 2 remainder 1
If there is no number that divides 7 evenly and leaves no remainder other than 1 and 7 itself, then 7 is a prime number
Ashley bought a total of 36 apples and bananas for a fruit salad. She bought 20 apples and the rest were bananas. If she divided the bananas equally into 4 bowls, how many bananas were there in each bowl?
4
2.75 divided by 5
0.55
2.7 + 5
7.7
5(7+2.5)- 2x3
41.5
25
composite
Check if 25 is divisible evenly by any number from 2 to the square root of 25 (rounded up to the nearest whole number). In this case, the square root of 25 is 5.
Divide 25 by the numbers starting from 2 up to 5 and check if there is any remainder.
25 ÷ 2 = 12 remainder 1 25 ÷ 3 = 8 remainder 1 25 ÷ 4 = 6 remainder 1 25 ÷ 5 = 5 remainder 0
If there is any number other than 1 and 25 itself that divides 25 evenly without leaving a remainder, then 25 is a composite number.
From the calculations above, we see that 25 is divisible evenly by 5, which is not 1 or 25 itself. Therefore, 25 is a composite number.
Diane wants to buy 80 new chairs for her restaurant. A local furniture store is selling the chairs at a cost of “2 chairs for $100”. How much will the chairs cost?
4,000
3.75 divided by 2.5
1.5
9.75 -3
6.75
3+ (5/2.5)x4
5.0 or 5
39
composite
Check if 39 is divisible evenly by any number from 2 to the square root of 39 (rounded up to the nearest whole number). In this case, the square root of 39 is approximately 6.24 (rounded up to 7).
Divide 39 by the numbers starting from 2 up to 7 and check if there is any remainder.
39 ÷ 2 = 19 remainder 1 39 ÷ 3 = 13 remainder 0 39 ÷ 4 = 9 remainder 3 39 ÷ 5 = 7 remainder 4 39 ÷ 6 = 6 remainder 3 39 ÷ 7 = 5 remainder 4
If there is any number other than 1 and 39 itself that divides 39 evenly without leaving a remainder, then 39 is a composite number.
From the calculations above, we see that 39 is divisible evenly by 3. Therefore, 39 is a composite number.
Sarah wants to create a budget for her monthly expenses. She earns $325 from her part-time job. Help Sarah figure out how much money she can spend on Craft Supplies each month
School books $50
Movies $30
Lunch money $50
Clothes $150
Candy $25
Craft Supplies ?
20.00
Sara is planning a party and wants to make sure there are enough cupcakes for all the guests. She wants to make cupcakes in batches of 24. If she needs a total of 72 cupcakes, how many batches of cupcakes does she need to make and how many cupcakes will be left over?
Step 1: Find the number of batches of cupcakes Sara needs to make. Total cupcakes ÷ Cupcakes per batch = Number of batches 72 ÷ 24 = 3 batches
Step 2: Multiply the number of batches by the cupcakes per batch to find the total number of cupcakes made. Number of batches × Cupcakes per batch = Total cupcakes made 3 × 24 = 72 cupcakes made
Step 3: Find the number of cupcakes left over. Total cupcakes made - Total cupcakes needed = Cupcakes left over 72 - 72 = 0 cupcakes left over
Answer: Sara needs to make 3 batches of cupcakes, and there will be 0 cupcakes left over.
Emily earns 15 per week from her allowance. She wants to spend some of her money on a new book that costs 8. She also wants to save a portion of her money each week. If Emily wants to have a balanced budget, how much money should she save each week?
To have a balanced budget, Emily should save the difference between her weekly earnings and the cost of the book.
Weekly earnings - Cost of book = Amount to save 15−15−8 = $7
Emily should save $7 each week to have a balanced budget.
What order does PEMDAS use
1. always left to right with M/D being equal
or
2. Always multiply and then divide
You always work left to right.
Multiplication and division are equals
addition and subtraction are also equals.
109
prime
Check if 109 is divisible evenly by any number from 2 to the square root of 109 (rounded up to the nearest whole number). In this case, the square root of 109 is approximately 10.44 (rounded up to 11).
Divide 109 by the numbers starting from 2 up to 11 and check if there is any remainder.
109 ÷ 2 = 54 remainder 1 109 ÷ 3 = 36 remainder 1 109 ÷ 4 = 27 remainder 1 109 ÷ 5 = 21 remainder 4 109 ÷ 6 = 18 remainder 1 109 ÷ 7 = 15 remainder 4 109 ÷ 8 = 13 remainder 5 109 ÷ 9 = 12 remainder 1 109 ÷ 10 = 10 remainder 9 109 ÷ 11 = 9 remainder 10
If there is no number that divides 109 evenly and leaves no remainder other than 1 and 109 itself, then 109 is a prime number.
From the calculations above, we see that 109 is not divisible evenly by any number other than 1 and 109 itself. Therefore, 109 is a prime number.
In a school auditorium there are 33 seats in each row of seats. How many rows are needed for 528 students to each have a seat?
16