Explain what is wrong:
“50 ÷ 7 is the same as 50 ÷ 10, (which is 5) then because I adding 3 to the divisor I now need to subtract 3: 5 - 3 = 2.”
• Estimate 35 • 49.• Show 3 different ways to find:
35 • 49.• Estimate 27984 ÷ 82. • Show 27984 ÷ 82 using the scaffolding
method.
• 35 • 49 is about 35 • 50. • Think: 30 • 50 = 1500, and 5 • 50 = 250, so
1750.• Methods: rectangular area, lattice
multiplication, Egyptian Duplation, any of the methods used by the kids.
• 27984 ÷ 82: 82 • 1 = 82; 82 • 10 = 820; 82 • 100 = 8,200; 82 • 1000 = 82,000.So, the quotient is between 100 and 1000, and is closer to 100. Now: 8 • 3 = 24, so guess 300.
27984 ÷ 82
• 82 • 1 = 82; 82 • 10 = 820; 82 • 100 = 8,200
82 ) 27984 24600 3384 1640 1744 1640 104 82 22
1 20 20 300
I’m thinking of a number. It is less than 50. When I divide it by 8, I get a remainder of 5. But when I divide it by 7, I get a remainder of 2. Use the manipulatives to find my number.
Do I Understand???• Given: 4 7
X 3 9 4 2 3 1 4 1__ 1 8 3 3
• Question: Without doing any work, what is 30 • 47? How do you know?
Do I Understand?• Given: 208 R 7
18 ) 3751 36
151144
• Question: Without doing any work, what is 200 • 18? How do you know?
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