FiveMinute Check over Lesson 4 1 Main Idea

Five-Minute Check (over Lesson 4– 1) Main Idea Example 1: Find a Compatible Dividend Example 2: Find a Compatible Divisor Example 3: Use Rounding and Compatible Numbers Example 4: Estimate to Solve Problems

• I will estimate quotients using rounding and compatible numbers.

Find a Compatible Dividend Estimate 145 ÷ 2 140 ÷ 2 Change 145 to 140 because 14 and 2 are compatible numbers. 140 ÷ 2 = 70 Divide mentally. Answer: So, 145 ÷ 2 is about 70.

Estimate 215 ÷ 3. A. about 55 B. about 60 C. about 65 D. about 70 1. 2. 3. 4. A B C D

Find a Compatible Divisor Estimate 3, 500 ÷ 80 3, 500 ÷ 70 Change 80 to 70 because 35 and 7 are compatible numbers. 3, 500 ÷ 70 = 50 Divide mentally. Answer: So, 3, 500 ÷ 80 is about 50.

Estimate 4, 800 ÷ 50. A. about 60 B. about 70 C. about 80 D. about 90 1. 2. 3. 4. A B C D

Using Rounding and Compatible Numbers Estimate 439 ÷ 52. Step 1 Round the divisor to the nearest ten. 439 ÷ 52 439 ÷ 50 Step 2 Change the dividend to a number that is compatible with 5. Notice it is easy to divide 45 by 5. 439 ÷ 52 450 ÷ 50

Using Rounding and Compatible Numbers Step 3 Divide mentally. Answer: So, 439 ÷ 52 is about 9. 450 ÷ 50 = 9

Estimate 629 ÷ 68. A. about 9 B. about 8 C. about 7 D. about 6 1. 2. 3. 4. A B C D

Estimate to Solve Problems Five students share 18 small pieces of veggie pizza equally. About how many pieces does each student get?

Estimate to Solve Problems One Way: Use compatible numbers 6 and 18. Another Way: 18 ÷ 5 18 ÷ 6 = 3 20 ÷ 5 = 4 Use compatible numbers 20 and 5. Answer: So, each student eats about 3 or 4 slices of veggie pizza.

Four friends share 18 pieces of candy equally. About how many pieces does each student get? A. about 3 or 4 pieces of candy B. about 4 or 5 pieces of candy C. about 5 or 6 pieces of candy D. about 7 pieces of candy 1. 2. 3. 4. A B C D

End of the Lesson

Five-Minute Check (over Lesson 4– 1) Image Bank Math Tool Chest Interpret the Remainder

(over Lesson 4– 1) Find 600 ÷ 6 mentally. A. 10 B. 20 C. 100 D. 150 1. 2. 3. 4. A B C D

(over Lesson 4– 1) Find 2, 800 ÷ 4 mentally. A. 700 B. 800 C. 750 D. 850 1. 2. 3. 4. A B C D

(over Lesson 4– 1) Find 270 ÷ 90 mentally. A. 13 B. 3 C. 4 D. 5 1. 2. 3. 4. A B C D

(over Lesson 4– 1) Find 4, 800 ÷ 800 mentally. A. 8 B. 5 C. 7 D. 6 1. 2. 3. 4. A B C D

(over Lesson 4– 1) Find 1, 800 ÷ 20 mentally. A. 90 B. 80 C. 85 D. 75 1. 2. 3. 4. A B C D

(over Lesson 4– 1) Find 25, 000 ÷ 500 mentally. A. 25 B. 45 C. 50 D. 60 1. 2. 3. 4. A B C D