Splash Screen. Lesson Menu Five-Minute Check (over Lesson 2–8) Main Idea and Vocabulary Example 1:Use Patterns to Multiply Mentally Example 2:Count Zeros.

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Presentation transcript:

Splash Screen

Lesson Menu Five-Minute Check (over Lesson 2–8) Main Idea and Vocabulary Example 1:Use Patterns to Multiply Mentally Example 2:Count Zeros to Multiply Mentally Example 3:Real-World Example

Main Idea/Vocabulary I will use basic facts and patterns to multiply multiples of 10, 100, and 1,000 mentally. product factor

Example 1 Step 1 Write the basic fact. Use a pattern to find the product of 4 × 600 mentally. 4 × 6 = 24 Step 2 Continue the pattern.4 × 60 = × 600 = 2,400 Answer: The product of 4 and 600 is 2,400. Use Patterns to Multiply Mentally

1.A 2.B 3.C 4.D Example 1 A.21 B.210 C.2,100 D.2,800 Use a pattern to find the product of 3 × 700 mentally.

Example 2 Find 50 × 5,000 mentally. Step 1 Write the basic fact.5 × 5 = 25 Step 2 Count the number of zeros in each factor. 50 × 5,000 1 zero + 3 zeros = 4 zeros Count Zeros to Multiply Mentally

Example 2 Count Zeros to Multiply Mentally Step 3 Write the zeros to the right of the product from Step ,000 Answer: So, the product of 50 and 5,000 is 250,000.

1.A 2.B 3.C 4.D Example 2 A.16,000 B.160,000 C.180,000 D.1,800,000 Find 20 × 8,000 mentally.

Example 3 One bale of hay weighs 50 pounds. There are 20 bales in the barn. What is the total weight of the hay? total weight = 20 × 50basic fact = 2 × 5 = 10 Since there are 2 zeros in the factors, write 2 zeros to the right of 10. So, 50 × 20 = 1,000. Answer: The bales of hay weigh 1,000 pounds.

1.A 2.B 3.C 4.D Example 3 A.30 pounds B.40 pounds C.120 pounds D.1,200 pounds An empty plastic barrel weighs about 30 pounds. A concert needs 40 barrels to fill for different beverages. How much will all 40 barrels weigh together?

End of the Lesson End Lesson

Resources Five-Minute Check (over Lesson 2–8) Image Bank Math Tool Chest Multiply Mentally

1.A 2.B 3.C 4.D Five Minute Check 1 (over Lesson 2–8) A.122; B.132; C.127; D.123; Find mentally. Show how you use compensation.

1.A 2.B 3.C 4.D Five Minute Check 2 (over Lesson 2–8) A.3.8; 9.8 – 6 B.3.7; 9.7 – 6 C.3.6; 10 – 6.4 D.3.9; 9.9 – 6 Find 9.6 – 5.9 mentally. Show how you use compensation.

1.A 2.B 3.C 4.D Five Minute Check 3 (over Lesson 2–8) A.23.2; B.23.3; C.23.1; D.23; Find mentally. Show how you use compensation.

1.A 2.B 3.C 4.D Five Minute Check 4 (over Lesson 2–8) A.25; 95 – 70 B.26; 96 – 70 C.24; 90 – 66 D.27; 90 – 63 Find 92 – 67 mentally. Show how you use compensation.

1.A 2.B 3.C 4.D Five Minute Check 5 (over Lesson 2–8) A.96.3; B.96.1; C.96.4; D.96.2; Find mentally. Show how you use compensation.

1.A 2.B 3.C 4.D Five Minute Check 6 (over Lesson 2–8) A.40.7; 49.7 – 9.0 B.40.8; 49.8 – 9.0 C.40.6; 50 – 9.4 D.40.9; 50 – 9.1 Find 49.6 – 8.8 mentally. Show how you use compensation.

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