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Solve these division problems mentally. Check your answers using a calculator.
- 8 ÷ 2
80 ÷ 2
800 ÷ 2
8000 ÷ 2 - 20 ÷ 10
200 ÷ 10
2000 ÷ 10
20,000 ÷ 10 - 27 ÷ 9
270 ÷ 9
2700 ÷ 9
27,000 ÷ 9 - 48 ÷ 6
480 ÷ 6
4800 ÷ 6
48,000 ÷ 6 - 5 ÷ 5
50 ÷ 50
500 ÷ 50
5000 ÷ 50
50,000 ÷ 50 - 28 ÷ 7
280 ÷ 70
2800 ÷ 70
28,000 ÷ 70
280,000 ÷ 700 - 42 ÷ 6
420 ÷ 60
4200 ÷ 60
42,000 ÷ 60
420,000 ÷ 6000 - 30 ÷ 5
300 ÷ 50
3000 ÷ 50
30,000 ÷ 50
300,000 ÷ 5000 - Show or tell how you solved the problems in Question 2B. If you used a rule, describe how the rule works.
Estimate the answers to the problems in Questions 4–6. Write a number sentence to show how you found your answers.
- A marching band has 200 members. The band members march in rows of nine. Estimate about how many rows of band members there are.
- A basketball league raised about $2500 for uniforms. If the money is shared equally among the seven teams in the league, estimate about how much money each team can spend on uniforms.
- Jessie is waiting in line at the amusement park to ride the Big Drop. She estimates that there are about 80 people in line. If the Big Drop holds six people per ride, about how many rides will Jessie have to wait through before it is her turn?
- For each of the problems shown below, do the following:
- Write a story or draw a picture that fits the problem.
- Write the division problem as a multiplication problem with a missing factor.
- Write a set of related number sentences that will help you solve the problem.
- Solve the problem and check that your answer is reasonable.
- 378 ÷ 9
- 885 ÷ 8