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Example 1: Determine Reasonable Answers

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Splash Screen

Five-Minute Check (over Lesson 3–7) Main Idea Example 1: Estimate with Money Example 2: Greater Numbers Lesson Menu

I will multiply to solve problems involving money and greater numbers. Main Idea/Vocabulary

Estimate with Money Kitty wants to buy 4 boxes of cereal that cost $3.54 each. She has $16. Does she have enough money to buy the cereal? $3.54 × 4 $4 × 4 Round $3.54 to $4 because $3.54 is closer to $4 than to $3. $4 × 4 = $16 Multiply mentally. Answer: So, the total cost of the cereal is about $16. Since the cost was rounded up, Kitty should have enough money. Example 1

Lynnelle wants to buy 5 cans of soup that cost $2. 18 each Lynnelle wants to buy 5 cans of soup that cost $2.18 each. Estimate the total cost of the soup? $7.00 $8.00 $10.00 $15.00 A B C D Example 1

Estimate the product of 5.9 and 25. 5.9 × 25 Greater Numbers Ramon averages 5.9 yards each time he runs the football. If he runs the ball 25 times in a single game, about how many yards will Ramon run? Estimate the product of 5.9 and 25. 5.9 × 25 6 × 25 = 150 Round 5.9 to 6. 6 × 25 = 150 Multiply. Answer: So, 6 × 25 is about 150. Ramon will run about 150 yards. Example 2

A gallon of gasoline costs $3. 10. Jacob’s car holds 12 gallons A gallon of gasoline costs $3.10. Jacob’s car holds 12 gallons. About how much will it cost Jacob to buy 12 gallons of gasoline? $25 $36 $42 $45 A B C D Example 2

Greater Numbers Use the calculator feature from your Math Tool ChestTM to find 228 × 50. Estimate 228 × 50 ≈ 200 × 50 or 10,000 Example 3

Greater Numbers Enter: Press: Enter: Press: Solution: Answer: So, 228 × 50 = 11,400. Example 3

Check for Reasonableness Greater Numbers Check for Reasonableness The estimate, 10,000 is less than 11,400. But one of the original numbers was rounded down. So, it is reasonable to expect that the estimate would be less than the exact answer. Example 3

Use the calculator to find 391 × 60. 23,460 19,550 17,595 14,354 A B C D Example 3

End of the Lesson End Lesson

Five-Minute Check (over Lesson 3–7) Image Bank Math Tool Chest Multiply Mentally Resources

Associative Property; 554 Associative Property; 500 (over Lesson 3–7) Use properties of multiplication to find 4 × 25 × 5 mentally. Show your steps and identify the properties you used. Associative Property; 554 Associative Property; 500 Commutative Property; 500 Commutative Property; 554 A B C D Five Minute Check 1

Commutative Property; 7,000 (over Lesson 3–7) Use properties of multiplication to find 50 × 35 × 4 mentally. Show your steps and identify the properties you used. Commutative Property; 7,000 Commutative Property and Associative Property; 7,000 Associative Property; 7,525 Commutative Property; 7,025 A B C D Five Minute Check 2

Commutative Property; 6,600 Commutative Property; 6,000 (over Lesson 3–7) Use properties of multiplication to find 6 × 50 × 22 mentally. Show your steps and identify the properties you used. Commutative Property; 6,600 Commutative Property; 6,000 Associative Property; 6,600 Associative Property; 6,000 A B C D Five Minute Check 3

Commutative Property and Associative Property; 1,240 (over Lesson 3–7) Use properties of multiplication to find (8 × 31) × 5 mentally. Show your steps and identify the properties you used. Commutative Property and Associative Property; 1,240 Commutative Property; 1,240 Associative Property; 1,420 Commutative Property and Associative Property; 1,420 A B C D Five Minute Check 4

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