Multiplication facts
12×9
108
Divide 120 ÷ 5
What is 24
Round the tens 1,694
What is 1,690
A party planner is decorating with balloons. If each decoration uses 12 balloons and they plan to create 15 decorations, how many balloons do they need in total?
Multiply the number of balloons per decoration by the number of decorations: 12 × 15 = 180.
Round thousands 1,098
1,000
600×5
3,000
A shipping company had 15,000 packages to deliver at the beginning of the week. By the end of the week, they had delivered 9,375 packages. How many packages remain to be delivered?
Subtract the number of packages delivered from the total at the start of the week:
15,000 - 9,375 = 5,625.
A farmer has 87 apples. Round this number to the nearest ten. How many apples does the farmer have?
90 apples
Sarah has 48 books on her shelf. If she buys 6 more sets of the same 8 books each, how many books will she have in total?
First, calculate the number of new books: 6 sets × 8 books = 48 books. Then, add this to her existing books: 48 + 48 = 96.
What is 900 - 367?
533
487×45
21,915
A manufacturer produces 250 laptops each day. If they operate 6 days a week for 50 weeks a year, how many laptops do they produce in a year?
First, calculate the total production per week:
250 laptops/day × 6 days/week = 1,500 laptops/week.
Then multiply by the number of weeks in a year:
1,500 × 50 = 75,000.
Sarah has 245 marbles, and her friend gives her 178 more. How many marbles does Sarah have now?
423 marbles
A gardener plants 7 rows of flowers, with 24 flowers in each row. If 3 rows of flowers die, how many flowers are still alive?
First, find the total number of flowers: 7 rows × 24 flowers = 168 flowers. Then, calculate how many flowers died: 3 rows × 24 = 72. Finally, subtract the dead flowers from the total: 168 - 72 = 96.
Round hundreds 8,258
8,300
589×86
50,654
A factory produced 8,200 widgets in January. By the end of March, it had produced 5,135 widgets. How many widgets were produced in February alone?
Answer: 1,865 widgets.
Explanation: First, find the total production for January and February combined, which is the total by March minus the production by January:
5,135 (March total) - 8,200 (January) = -3,065 (which indicates February’s production is positive, meaning 1,865 widgets must be added to January’s 8,200). This is calculated as:
Total production until March (8,200) - January production (8,200) = February production = 5,135.
A bookstore had 350 books. After a sale, there are 127 books left. How many books were sold?
Subtract the number of books left from the original number:
350 - 127 = 223.
An author writes 35 pages a day. If she continues this pace for 6 weeks (7 days a week), how many pages will she have written?
35 pages/day × 42 days = 1,470 pages.
A library has 3,456 fiction books and 2,789 non-fiction books. How many books are in the library in total?
Add the number of fiction books to the number of non-fiction books:
3,456 + 2,789 = 6,245.
1,267×23
29,141
What is 100 ÷ 25?
4
A city had a population of 150,000 at the beginning of the year. During the year, 12,500 people moved in, and 8,750 people moved out. What is the population at the end of the year?
First, calculate the net change in population by adding those who moved in and subtracting those who moved out:
12,500 - 8,750 = 3,750.
Then add this to the initial population:
150,000 + 3,750 = 153,750.
An animal shelter has 9 cages, and each cage holds 8 animals. If 3 cages are empty, how many animals are currently in the shelter?
First, find the total number of animals if all cages are full: 9 cages × 8 animals = 72 animals. Then, calculate the number of empty cages: 3 × 8 = 24. Finally, subtract the empty cages from the total: 72 - 24 = 48.
A factory produced 5,750 units of a product in January. By the end of February, they had produced 3,452 units. How many more units were produced in January than in February?
find the difference in production between the two months:
5,750 - 3,452 = 2,298.