Vocabulary
A number that is close to an exact amount. It tells about how much or about how many
Estimate
A bookstore has 24 shelves. Each shelf holds 16 books. How many books are there altogether?
384
What is 10 x 20
200
What is 12 x 14?
168
What is 24 x 2
48
A way to write numbers by showing the value of each digit Example: 253 = 200 + 50 + 3
Expanded Form
There are 18 buses going on a field trip. Each bus has 32 students. How many students are going on the field trip?
576
What is 20 x 40?
800
What is 23 x 34?
782
What is 37 x 5
185
The value of a digit in a number, based on the location of the digit
Place Value
A bakery makes 27 trays of cookies. Each tray has 14 cookies. How many cookies does the bakery make in total?
378
What is 90 x 50?
4,500
What is 38 x 45?
1,710
What is 76 x 8
608
To exchange amounts of equal value to rename a number
Regroup
A soccer tournament sells 35 tickets each day for 22 days. How many tickets are sold altogether?
770
What is 70 x 60?
4,200
What is 15 x 23?
345
What is 96 x 7
672
The property that states that you can group factors in differently ways and still get the same product
Associative Property
A factory packs 46 pencils into each box. If the factory fills 13 boxes, how many pencils are packed in total?
598
What is 60 x 90?
5,400
What is 34 x 56?
1,904
What is 73 x 9
657