Multiplying Decimals

Multiplying Decimals

Estimating and Multiplying

Flocabulary

• https://www.flocabulary.com/unit/multiplying-decimals/

Poll

Ms.Moore went to the store and bought 9 packs of water bottles for $3.37 each. About how much did she spend?

What should we round $3.37 to.... which is it closest too?

• $3.00

• $4.00

Poll

Ms.Moore went to the store and bought 9 packs of water bottles for $3.37 each. About how much did she spend?

If we round to $3 what should our answer be closer to?

• 27

• 36

Poll

Ms.Moore went to the store and bought 9 packs of water bottles for $3.37 each. About how much did she spend?

Is this an over or under estimate?

• over estimate

• under estimate

Steps to solve these problems

• Look at the decimal and round it to the nearest WHOLE NUMBER

• Multiply the 2 whole numbers together

• If you rounded down you know this is an UNDER estimate. If you rounded UP you know this answer is an OVER estimate

Multiple Choice

Jewls goes shopping for birthday decorations. She buys 12 goodie bags for $8.75 each. About how much will this cost her?

• between 96-100

• between 102-108

• between 108-112

• between 92-96

Multiple Choice

Mr.Keady goes to the store to buy chicken for a family BBQ. He buys 4.3 pounds of chicken. Each pound costs $1.23. About how much does he spend on chicken?

• between $3-4

• between $5-6

• between $6-7

• between $7-8

Fill in the Blanks

Allie goes on a trip to pick apples. She buys 16 pounds of apples to make apple pies. Each pound costs $3.65. About how much money did she spend on apples?

Multiple Choice

Luke runs 13.2 miles per week. If he runs the same amount of miles for 8 weeks how many miles will ha have run? (THIS IS AN EXACT AMOUNT THERE IS NO ABOUT)

• 105.6

• 104.3

• 10.56

• 106.45

Poll

Now that we know the estimate lets find the EXACT AMOUNT

Allie goes on a trip to pick apples. She buys 16 pounds of apples to make apple pies. Each pound costs $3.65. About how much money did she spend on apples?

• 34.8

• 62.3

• 58.4

• 62.8

Multiple Choice

Exit Ticket

Justin goes to the store to buy packs of water. He buys 14 packs for $8.76 each. About how much money does he spend on water?

• 112

• 125

• 126

• 132