Muliplication
798 x 4=
3,192
There are 63 stickers in a box. If there are 45 boxes, how many stickers are there?
2,835 stickers
(40 x 30) + (40 x 2) + (2 x 30) + (2 x 2)
=1,344
Is the equation true? Yes or No and why?
70 x 400 = 2,800
No. There are three zeros total in 70 x 400 when looking at the place value of each number. The answer should be 28,000.
56 x 65 =
3,640
A student bought 15 bags of small mystery prizes with 13 prizes in each bag. They also bought 34 bags of large mystery prizes with 26 prizes in each bag. How many more large prizes are there than small prizes? Show your work.
15 x 13 = 195 small prizes
34 x 26 = 884 large prizes
884 - 195 = 689 large prizes
546 x 8 =
4,368
83 x 46 =
46 = 40 + 6
80 x 40 = 3200
80 x 6 = 480
3 x 40 = 120
3 x 6 = 18
3,200 + 480 + 120 + 19 =3,818
True or False?
An Estimate of 7 x 83 = 7,600
No.
7 x 80 = 5,600
835 x 45
37,575
Ady drives a bus filled with 25 people to Chicago. She charges $58 per person to go on the bus. How much money does she make?
25 x 58 = $1,450
Estimate 25 x 34 by rounding each number to the nearest ten. Solve. Then solve the original problem using area method.
34 = 30
30x30 = 900 estimate
25 x 34 = 850
24 x 68 =
24 x 68 = (20 x 60) + (20 x 8) + (4 x 60) + (4 x 8)
1200 + 160 + 240 + 32 = 1,632
The best estimate for 48 x 20 is that it must be greater than ? but less than ?.
48 rounds UP to 50
20 stays at 20
50 x 20 = 1,000
It must be less than 1,000 since we rounded up.
48 round down to 40
20 stays at 20
40 x 20 = 800
It must be greater than 800 since we rounded down.
A. Solve 8,453 x 3 =
B. Use estimation to explain why your answer is reasonable.
A. 25,359
B. 8,000 x 3 = 24,000. I rounded 8,453 to the nearest thousand then multiplied. The answer is close to the estimate.
There is bake sale at the community center. The price for each baked good is $6. If 534 baked goods are sold, how much money will be made at the sale?
6 x 534 = $3,204
6,583 x 23 =
151,409
98 x 72 =
98 x 72 =
(90 x 70) + (90 x 2) + (8 x 70) + (8 x 2)
6300 + 180 + 560 + 16 = 7,056
3,453 x 28 =
96,684
Solve the problem & Show your work
342 x 5 = 1,710
483 x 5 = 2,415
1,710+2,415 = 4,125 hours
Show Area Model & Expanded Notation to find 39 x 58
2,262
(30 x 50) + (30 x 8) + (9 x 50) + (9 x 8)
1500 + 240 + 450 +72
Show Area Model & Expanded Notation to find 72 x 90
6,480
(70 x 90) + (70 x 0) + (2 x 90) + (2 x 0)
6300 + 0 + 180 + 0
6,480
4,689 x 97 = $454,833