Rounding & Estimating
Round both factors to the greatest place and solve the estimate.
51 x 84 =
50 x 80 = 4,000
29 x 78
2,262
EIght hundred twenty-three people paid $1.50 for a
snow cone at the carnival. How much
was spent on snow cones?
823 x $1.50 = $1,234.50
Write in expanded (factored) form, and standard form
82
8 x 8
64
Write the number in Standard Form
(7 x 103) + (6x102) + (5 x 101) + (4 x 100)
7,654
Use front end estimation to estimate the problem
5 x 8,231 =
5 x 8,100 = 40,500
2,846 x 70
199,220
A shuttle bus holds 50 people. It goes to drop people off 6 times a day. How many people does it drop off over the course of 3 days?
(50 x 6) = 300
300 x 3 = 900 people
Write in exponent form, and standard form
4 x 4 x 4 x 4
44
256
What property is this and what is the answer?
789 + 0 =
789 + 0 =
Identity
Round both factors to the greatest place and solve the estimate.
19 x 9,624 =
20 x 10,000 = 200,000
$25.38 x 56
$1,421.28
Mr. Mack drives his truck 276 mi, drops off the load
he is carrying, and picks up another load to haul
back. If his odometer reads 126,312 mi when he
arrives home, what did the odometer read before
he left home to make the trip?
276 x 2 = 552
126, 312 - 552 = 125,760 Miles
Write Prime or Composite
Write all factors
24
1,2,3,4,6,8,12,24
(1x24, 2x12, 3x8, 4x6)
Composite
Write the number in Standard Form
(6x102) + (5 x 101) + (4 x 100) + (9 x 1/101)
654.9
Use front end estimation to estimate the problem
5 x 86,731 =
5 x 87,000 = 435,000
621,721 x 328
203,924,488
I travel 10 miles each Sunday for church. I went 5 weeks in a row. For 2 of those weeks I drove 15 miles after to lunch. How many miles did I travel on Sundays combined?
10 x 5 = 50
2 x 15 = 30
30 +50 = 80 miles
Whats the greatest common factor of 16 and 24?
8
(1, 2, 4, 8)
8 × 14 = (8 × 7) + (8 × _____)
7