Basically
8 x 9
72
3 x 10
30
28 x 4
112
Mr. Pearson has 410 cookies. Miss Robyn baked 4 times as many as he had. How many cookies did Miss Robyn bake?
1,640 cookies
5 x 9 = 46
5 x 9 = 45
4 x 7
28
60 x 10
600
42 x 8
336
Mrs. Scholten can fit 3,082 rocks on one shelf. How many rocks can she fit on 6 shelves?
18,492 rocks
55 x 6 = 385 Find and correct the mistake.
Incorrect fact. 5 x 6 = 30, not 35.
55 x 6 should be 330
6 x 7
42
5 x 600
3,000
621 x 5
3105
Group 1 = 456 Group 2 = 385
Group 3 = 1,517 Group 4 = 2,049
If this is how many thingamabobs are collected in one week by each group, how many thingamabobs will be collected in 3 weeks by group 2?
1,155 thingamabobs
1,268 x 4 = 4,842
They didn't regroup. 1,268 x 4 = 6,072
9 x 6
54
6,000 x 4
24,000
806 x 4
3224
Group 1 = 456 Group 2 = 385
Group 3 = 1,517 Group 4 = 2,049
About how many thingamabobs will be collected in 2 weeks by groups 4 and 1?
About 5,000 thingamabobs.
If three cities in South Dakota each have a population of 3,803 people, about how many people live in all three cities combined? Marsha said 11,409 people. Find and correct her error.
Marsha didn't round. It should be about 12,000 people.
7 x 7
42
4 x 5,000
20,000
1,534 x 4
6,136
Mrs. Harte corrected 38 math tests worth 8 points each. If all students got all the questions correct, how many total points were scored on the math tests?
304 total points
Joan said that her brother works Monday, Wednesday, Thursday, and Friday every week. She said that if he works for 16 weeks he will have worked 80 days. What is her mistake?
She multiplied 16 by 5 instead of 4. He would have worked 64 days.
4 x 4
16
3 x 300
900
2,603 x 3
7,809
Popsicles are $3 each. How much do 94 popsicles cost?
$282
Lynn reads 482 pages a month. She said that if she read for 9 months she would read about 3,600 pages. Find and correct Lynn's mistake.
Lynn rounded 482 down to 400 instead of up to 500. She actually reads about 4,500 pages in 9 months.
12 x 12
144
9 x 90
810
45,054 x 3
125,162
Mrs. Kellen save $3,987 a month for 8 months. How much did she save altogether?
$31,896
Mr. Pearson said that he makes 78 blocks of cheese two times a month and 96 blocks of cheese once a month. Dorinda said that he makes about 252 blocks of cheese each month. Find and correct her error.
She didn't round before completing her operations. He makes about 260 blocks each month.