Multiples of 10
20 x 18
20 groups of 10
20 groups of 8
200 + 160 = 360
20 x 20
400
There are 14 rows of windmills and 38 windmills in each row. Round to the nearest 10 AND Solve.
10 x 40 = 400
23 - 27 = round to 25 *Quarter trick :)
Mrs. Daugaard buys 22 cases of pop for a school picnic. There are 24 cans in each case.
Using compatible numbers, write a number sentence & solve.
22 --> 20
24 --> 25
20 x 25 = 500 cans
Aylen is making 20 necklaces to sell at the craft fair. She needs 17 beads on each necklace. How many beads does she need in all?
20 x 17 =
20 x 10 = 200
20 x 7 = 140
200 + 140 = 340 beads
40 x 24
40 groups of 20
40 groups of 4
800 + 160 = 960
50 x 90
4,500
Round & Solve
84 x 47
80 x 50 = 4,000
A library places books in a section with 21 shelves. Each shelf fits 38 books.
Use compatible numbers to estimate the number of books the shelves can hold. *Round*
21 --> 20
38 --> 40
20 x 40 = 800 books
2 x $5 = $10
3 x $4 = $12
$10 + $12 = $22
$50 - $22 = $28
40 x 15
40 groups of 10
40 groups of 5
400 + 200 = 600
90 x 70
6,300
A tree is Ms. Harms' yard is 48 feet tall. About many inches tall is the tree?
Hint - Round 48 to nearest 10.
Hint #2 - 12 inches in 1 foot.
Round 48 to 50
50 x 12 = 600 feet tall
50 groups of 10 = 500
50 groups of 2 = 100
500+100 = 600 feet tall
A florist made centerpieces for a wedding. She put 22 roses in each centerpiece. Use compatible numbers to show how many roses she will need to make 26 centerpieces.
*23-27 = round to 25 *quarter trick
22 --> 20
26 --> 25
20 x 25 = 500 roses
40 x 50 = 2,000 tickets
Ms. Harms favorite football team is.....
KANSAS CITY CHIEFS!
What town does Ms. Harms live in?
Colman