Base 10
3 x 6 tens=___tens
3 x 6 hundreds=____hundreds
3 x 6 thousands=_____thousands
18 tens, hundreds, thousands
Round to the nearest hundred to estimate 7 × 386.
2,800
Break apart 43 to find 6 × 43. What is the product?
258
A school orders 9 boxes of pencils. Each box has 500 pencils. How many pencils does the school order?
4,500 pencils
Module 1: What is the value of the 8 in 482,615?
80,000
5x700=
3,500
Round to the nearest thousand to estimate 4 × 5,812.
24,000
Break apart 57 to find 4 × 57. What is the product?
228
A bakery makes 300 cookies on each tray. On Saturday, they bake 6 trays. How many cookies do they bake?
1,800 cookies
Round 345,729 to the nearest ten thousand.
350,000
6x7,000
42,000
Which is the best estimate for 3 × 248 using compatible numbers?
3x240=720
What is the expression that correctly breaks apart 8 × 312?
(300x8)+(8x10)+(8x2)
A farmer plants 7 rows of corn. Each row has 482 plants. About how many corn plants are there? Round to the nearest hundred to estimate.
What is 52,307 − 18,469?
33,838
Look at the pattern: 3 × 8 = 24, 3 × 80 = 240, 3 × 800 = ?
2,400
A library has 8 shelves. Each shelf holds 613 books. About how many books does the library hold? Round to the nearest hundred to estimate.
4,800 books
Jada finds 5 × 49 by thinking 5 × 50 = 250, then adjusting. What is 5 × 49?
245
The school auditorium has 5 rows of seats. Each row has 34 seats. Break apart 34 to find how many seats there are in all.
170 seats in the hall
A rectangular garden is 12 feet long and 7 feet wide. What is its perimeter?
38 feet
What is 5 × 400?
2,000
Carlos has $100. He wants to buy 4 concert tickets that cost $23 each. Does he have enough money? Which estimate shows why?
1.No, because 4 × 30 = 120
2.No, because 4 × 25 = 100 and each ticket costs more than $25
3.Yes, because 4 × 25 = 100 and each ticket costs less than $25
4.Yes, because 4 × 20 = 80
3.Yes, because 4 × 25 = 100 and each ticket costs less than $25
Ben has 3 packs of trading cards. Each pack has 26 cards. Use mental math to find how many cards he has in all.
78 cards
18 students go on a field trip to a science museum. Each ticket costs $5. How much money are the students spendin?
$90
Sam has 6 stickers. Lily has 4 times as many stickers as Sam. How many stickers does Lily have?
24 stickers