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Estimation
Mental Math
÷ Using Traditional Algorithm
÷ Handy Facts
Word Problems
100
Use mental math to solve 300 ÷ 3
What is 100?
100

200 ÷ 4

What is 50?

100
78 ÷ 5
What is 15 R3?
100
541 ÷ 4
What is 135 R1?
100
Mrs. Straw's class is buying scrapbooks for her students. Her budget is $350. Each scrapbook costs $9. How many scrapbooks can she buy?
What is 38 scrapbooks? The remainder means she has $8 left over.
200
Estimate to solve. 810 ÷ 10
What is 8? (Round 810 to 800 and solve 800 ÷ 10)
200

360 ÷ 60

What is 6?

200
47 ÷ 2
What is 23 R1?
200
789 ÷ 5
What is 157 R4?
200
Mrs. Best swam 932 meters in 3 days. If she swam the same amount everyday, about how many meters did she swim total.
Either Answer is accepted: About 310 meters (932 is rounded to 930, then solve 930 ÷ 3) or About 300 meters (932 is rounded to 900, then solve 900 ÷ 3)
300
Estimate to Solve: 180 ÷ 12
What is 20? (Round 180 to 200 and 12 to 10. Then solve 200 ÷ 10)
300

640 ÷ 8

What is 80?

300
257 ÷ 9
What is 28 R5?
300
703 ÷ 7
What is 100 R3?
300
In 4 hours, Lillianna read 52 pages. If she read the same number of pages each hour, how many pages did Lillianna read in one hour?
What is 13 pages?
400
Estimate using compatible numbers to solve 244 ÷ 8
What is 30? (Round 244 to 240, then solve 240 ÷ 8)
400

720 ÷ 90

What is 8?

400
1484 ÷ 8
What is 185 R4
400
505 ÷ 2
What is 252 R1?
400
Mrs. Nilsen wants to join the swim team. She practices 812 minutes in 4 weeks. She practices the same number of minutes each week. How many minutes does Mrs. Nilsen practice each week?
What is 203 minutes?
500
Estimate to Solve. 121 ÷ 42
What is 3? (Round 121 to 120, round 42 to 40. Then solve 120 ÷ 40)
500

1,200 ÷ 30

What is 40?

500
1,103 ÷ 7
What is 157 R4
500
8,290 ÷ 11
What is 753 R7?
500
There are 3,487 guests invited to a dinner at Eagle Ridge. Each table seats 8 guests. How many tables are needed.
All guests need a table, so Eagle Ridge would need 436 tables total.