Circles
Polygons
Patterns
Algebra
Estimation
100
What is the formula for circumference?
2πr or πD
100
How do you find the perimeter and area of a square?
Perimeter = You add the sides
Area = You multiply two sides
100
What are the next two numbers in this pattern?
1, 3, 5, 7, 9...
11, 13
100
What is x?
5x + 20 = 40
x = 4
100
1294 + 9211 ≈ ?
10,000
200
What is the formula for the area (circle)?
πr2
200
What is the area and perimeter of this square?
Area = 5 x 5 = 25 cm2
Perimeter = 5 + 5 + 5 + 5 (or 5 x 4) = 20 cm
200
What are the next two numbers in this pattern?
2, 4, 8, 16...
36, 72
200
What is x?
x - 11 = 20
x = 9
200
2859 + 6420 + 7824 ≈
17000
3000 + 6000 + 8000 = 17000
300
What is the circumference of this circle?
12π cm
2πr = 2π6 = 12π cm
300
What is the perimeter of this polygon?
10 + 11 + 6 + 5 + 4 + 6 = 42
Or the easier way:
(10 x 2) + (11 x 2) = 20 + 22 = 42
300
What are the next two numbers in this pattern?
3, 6, 5, 10, 9, 18, 17...
34, 33
300
What is x?
7x + 20 = 55
x = 5
300
321 x 929 ≈
270,000
300 x 900
400
What is the area of this circle?
64π cm2
πr2 = π82 = π(8 x 8)= 64π cm2
400
What is the area of this polygon?
10 x 5 = 50
6 x 6 = 36
50 + 36 = 86 cm2
400
What are the next two numbers in this pattern?
2.5, 2, 10, 9.5, 17.5, 17...
25, 24.5
400
What is x?
4x + 109 = 145
x = 9
36 + 109 = 145
400
7210 x 424 ≈
2,800,000
7000 x 400 =
500
What is the area of this circle?
6.25π cm2
πr2 = π2.52 = π(2.5 x 2.5) = 6.25π cm2
500
If three students put these tables together, what would the perimeter of these three tables be?
Hint: The places that stick together are NOT part of the perimeter.
1.5 x 8 = 12 m
500
What are the next three numbers in this pattern?
7, 10, 3, 5, 8, 1, 3...
6, -1, 1
Rule: +3, -7, +2
500
What is x?
12x + 1000 = 1120
x = 10
500
81290 x 79812 ≈
(You can just say the number of zeros and the first two numbers)
6,400,000,000
80000 x 80000 =