Add
52+48
100
34-18
16
Estimate the sum of 76 + 45
80 + 50 = 130
Mr. L has two math riddles. There are 67 riddles in one book. There are 54 riddles in the second book. How many riddles are in both books together?
121 riddles
Greta solved the following problem. What is her mistake?
1,090 - 710 = 1,800
She added instead of subtracting
307+1,558
1,865
203-74
129
Estimate the difference of 156 - 92
160 - 90 = 70
Selene is the star player on her basketball team. Her goal is to score 115 points this season. She has already scored 46 points. How many points does she have left to score?
69 points left.
Fabio solved the following problem. What is his error? What is the correct answer?
250 - 73 = 223
Fabio did not regroup. The correct answer is 177.
Find the sum of 499 and 508
1,007
Find the different between 5,006 and 738.
4,268
Nick has 421 legos. Jimmy has 245 legos. ABOUT how many more legos does Nick have than Jimmy? Round to the nearest 10.
420 - 250 = 170 leogs
Minnie's cat is on a special diet. She has to feed her cat 175 grams of dry cat food and 304 grams of wet cat food each day. How many more grams of wet food does her cat eat?
258 grams more
Tara solved the following problem and showed her work. Is she correct? Why or why not?
70,340 - 2,081 = 78,259
No, she is not correct.
The correct answer is 68,259
Kylie is running for school president and she surveys 3 different classes. In 1st grade, 57 students voted for her. In 2nd grade 104 students voted for her. In 3rd grade, 18 students voted for her. How many votes does she have so far?
179 votes
Miles and Aiden started taking band in school. Their teacher told them to practice 310 minutes per week. If they've already practices 75 minutes this week, how many more minutes do they need to practice?
235 minutes
The Empire State building is the tallest building in NYC at 790 feet. The tallest building in Boston is 428 feet. Estimate the different between the heights of the two buildings.
800 - 430 - 370 feet taller.
Pete takes piano lessons. Her teacher told her to practice 300 minutes before the next lesson. She practiced 135 minutes Monday and 87 minutes Tuesday. About how much more time does she have to practice this week?
100 + 90 = 190
300 - 190 = about 110 minutes left.
Valerie's teacher said she should always estimate her sum before solving a problem to check if her answer is reasonable. Is Valerie's answer correct? Why or why not?
2,145 + 1,600 = 3,745
2,000 + 1,000 = 3,000
She got the correct original problem but she did not round correctly. 1,600 should round to 2,000.
Kim and Jay love running. Last year, Kim ran 1,825 miles and Jay ran 793 miles. This year, Kim ran 916 miles and Jay ran 1,509 miles. Who ran more miles in total?
Write an inequality to compare.
Kim ran more than Jay:
2,741 > 2,302
Sammy is selling new speakers. Her goal is to sell 4,00 speakers. So far, she has sold 2,709 speakers. How many more does she have to sell?
1,291 speakers
Tammy and her brother are saving money to get a new X-Box, which costs $499. Tammy saved up $92 in allowance, $45 from dog-walking, and $67 from shoveling driveways. Her brother has $23 in allowance and $85 in babysitting. About how much have they saved?
About $320
The ferris wheel at the amusement park needs to be checked for damages after 3,000 times. Last week, it went 78- rounds. This week, it went 698 rounds. How many rounds does it have left before it needs to be checked?
780 + 698 = 1,478 rounds so far
3,000 - 1,478 = 1,522 rounds left
Nancy read the following word problem and solved it. Is she correct? Why or why not?
The Museum of Science is the most popular during the summer months. In January, about 1,289 people visited each week. In July, about 5,075 people visited each week. How many more people visited in the summer than in the winter?
1,289 + 5,075 = 6,364 people
She is not correct. The problem asks 'how many more' which means she is supposed to compare the two numbers by subtracting, not by adding.