Multiplication
43 x 8 = ?
344
8 x 60 = ?
480
What does 493 round to?
500
What are the partial products when finding 1,874 x 3?
3,000
2,400
210
12
At a coffee shop, the shop sells 835 cups of coffee in one week. How many cups of coffee does the shop sell in 6 weeks?
6 x 835 = ?
5,010 cups of coffee sold in 6 weeks.
57 x 9 = ?
513
5 x 300 = ?
1,500
What does 678 round to?
700
If there are 65 rows of strawberries planted with 9 strawberry plants planted in each row, how many strawberry plants were planted?
9 x 65 = ?
585 strawberry pants were planted
Mr. Luca would like to purchase a digital keyboard for each of his 3 nieces and 1 nephew. They keyboard costs $105.
Mr. Luca thinks the total cost should be about $200. Is this amount reasonable?
No, because if each keyboard costs about $100 each, the price for a total of 4 keyboards will cost way more than $200. The total would be closer to about $400.
215 x 7 = ?
1,505
700 x 8 = ?
5,600
What does 707 round to?
700
Mr. Ortiz sells tortillas in bags of 25 and in bags of 50. If he sells 4 bags of 50 and 6 bags of 25, how many tortillas did Mr. Ortiz sell?
(25 x 6) = 150
(50 x 4) = 200
150 + 200 = 350
Tickets for a resort cost $1,182 each for adults and $459 each for children. Find the cost for 3 adult tickets and 3 child tickets.
1,182 x 3 = a
a = 3,546
459 x 3 = c
c = 1,377
3,546 + 1,377 = t
t = 4,923
It costs $4,923 for all of the tickets.
1,250 x 8 = ?
10,000
7 x 9,000 = ?
63,000
What does 7,632 round to?
8,000
Alberto rode the train 198 miles round trip 4 times last month. Explain how to use mental math to find the total distance Alberto traveled.
Split 198 into expanded form.
(100 x 4) + (90 x 4) + (8 x 4) =
400 + 360 + 32 = 792
Bea's Bakery bakes 215 cookies and 45 muffins every hour. How many bakes goods are baked in 4 hours?
215 x 4 = c
c = 860
45 x 4 = m
m = 180
860 + 180 = b
b = 1,040
Bea's Bakery makes 1,040 baked goods in 4 hours.
4,233 x 7 = ?
29,631
7,000 x 4 = ?
28,000
What does 5,703 round to?
6,000
Which expressions could be used to find 1,235 x 9?
a) 9 x (1,000 + 200 + 20 + 5)
b) 9 x (1,000 + 200 + 30 + 5)
c) (9 x 1,000) + (9 x 200) + (9 x 30) + (9 x 5)
d) 9 x 1,235
e) 1,235 + 9
b, c, d
Which of the following is equivalent to
(400 x 3) + (36 x 3)?
a) 436 divided by 3
b) 400 x 100
c) 436 x 3
d) 400 x 3 + 36
C