Rounding
Round the greatest place value: 37
40
Estimate to solve: 67 x 9
70 x 9= 630
Solve: 600 x 7= b
b = 4,200
Solve: 8,000 x 4 = n
n = 32,000
What are the partial products for 217 x 4?
800, 40, 28
Round the greatest place value: 203
200
Estimate to solve 182 x 5
200 x 5= 1,000
Solve: 89 x 4 = x
x = 356
Solve: 56 x 6 = u
u = 336
How can we write 8 x 72= s using repeated addition?
s = 72 + 72 + 72 + 72 + 72 + 72 + 72 + 72
Round the greatest place value: 178
200
Estimate to solve: 436 x 7
400 x 7= 2,800
Solve: 4 x 154 = r
r = 616
Solve: 394 x 9 = q
q = 3,546
True or false: 327 x 9 can be written as (9 x 300) + (9 x 20) + (9 x 7)
True! That is expanded notation.
Round the greatest place value: 4,568
5,000
Estimate to solve: 4,883 x 8
5,000 x 8= 40,000
Solve: 4 x 1,817 = w
w = 7,268
Solve: 3,208 x 5 = z
z = 16,040
Dobby’s Doggeria makes 317 hotdogs and 294 corndogs every day. How many items are made in 3 days?
1,833
Round the greatest place value: 7,099
7,000
Estimate to solve: 8,786 x 4
9,000 x 4= 36,000
Solve: 2,361 x 6 = c
c = 14,166
Solve: 8,762 x 8 = f
f = 70,096
Mr. Mooney sells taco party packs in trays of 30 tacos and in trays of 60. If he sells 5 trays of 60 and 6 trays of 30, how many tacos did Mr. Mooney sell?
480 tacos