Estimation
Estimate:
679 + 345 =
700 + 300 = 1,000
Solve:
474 + 123 = a
a = 597
Solve:
89 - 22 = g
g = 67
What Property is represented below?
7 + 0 = 7
Identity Property of Addition
What is a variable?
A letter that represents an unknown number
Estimate:
1,898 - 987 =
2,000 - 1,000 = 1,000
Solve:
1,976 + 4,868 = b
b = 6,844
Solve:
834 - 123 = f
f = 711
What Property is represented below?
6 + 7 = 7 + 6
Commutative Property of Addition
What is the variable in this equation?
7,987 + b = 10,000
b is the variable
Estimate:
6,989 + 4,767 =
7,000 + 5,000 = 12,000
Solve:
34,977 + 23,879 = c
c = 58,856
Solve:
34,000 - 23,987 = h
h = 10,013
Fill in the blank:
89 + ____ = 89
0
Johnathan travels 4,879 miles to see his family. Jack travels 8,789 miles to see his family. How many more miles did Jack travel than Johnathan?
8,789 - 4,879 = m
m = 3,910 more miles
Estimate:
67,364 - 26,576 =
70,000 - 30,000 = 40,000
Solve:
89,223 + 3,879 = d
d = 93,102
Solve:
56,098 - 34,999 = k
k= 21,099
What Property is represented below?
(1 + 2) + 3 = 1 + (2 + 3)
Associative Property of Addition
In week one, Jackie sells 298 boxes of candy for a fundraiser. In week two she sells 154 boxes. Her sister sells a total of 498 boxes. How many more boxes did her sister sell than Jackie?
298 + 154 = boxes of candy
b = 452 boxes of candy
498 - 452 = more boxes of candy
m = 46 more boxes of candy
Estimate:
923,899 - 567,879 =
900,000 - 600,000 = 300,000
Solve:
123,799 + 345,863 = e
e = 469,662
Solve:
456,000 - 298,786 = m
m = 157,214
Fill in the blank:
56 + (12 + 87) = (56 + 12) + _____
87
Julie needs $900 to purchase a new scooter. She has saved $234 from babysitting, and $376 from her birthday and the holidays. How much more money does Julie need to purchase the scooter?
234 + 376 = p
p = $610 total saved
900 - 610 = s
s = $290 more to purchase the scooter