Division, patterns and estimating quotients 10 25-10
Transcript of Division, patterns and estimating quotients 10 25-10
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Division
Patterns and Estimating Quotients
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Arrays
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Division Math Vocabulary
• Compatible Numbers– Numbers in a problem that are easy to work with mentally.
• Division– An operation that is the opposite of multiplication. It breaks
a number up into even groups.• Dividend
– A number that is being divided• Divisor
– The number by which the dividend is being divided• Quotient
– The answer or result of a division problem
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Dividing Mentally!
600 ÷ 6 =
100
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Dividing Mentally!
270 ÷ 90 =
3
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Dividing Mentally!
25,000 ÷ 500 =
50
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Draw a Picture to Solve
92 ÷ 4 =
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Draw a Picture to Solve
78 ÷ 6 =
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We can Round in Division Too!!!
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The Puppy Problem
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Find a Compatible Dividend
Estimate 156 ÷ 3156 ÷ 3
150 ÷ 3
= 50
We change 156 to 150 because 150 and 3 are compatible numbers
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Find a Compatible Divisor
Estimate 3,200 ÷ 903,200 ÷ 90
3,200 ÷ 80
=40
We change 90 to 80 because 32 and 8 are compatible numbers.
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Bring to the Nearest TenEstimate 228 ÷ 43
228 ÷ 43
228 ÷ 40
240 ÷ 40
=6
We change the dividend to a number that is compatible with 4. Look, It’s easy to divide 24 by 4.
We change the divisor to the nearest 10.
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Three Ways to Round
45 ÷ 6 = 45 ÷ 6 = 45 ÷ 6 =
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Real-World Problems
Exact Answer:
12 oz.: __________
20 oz.: __________
Estimated Answer:
12 oz.: __________
20 oz.: __________