Vocabulary
677 is about 700 when ________ to the nearest hundred.
rounded
27 + 62 =
89
87 - 62 =
25
Paul has 72 cards. He gives away 59 cards. About how many cards does he have left? Round each number to the nearest 10.
About 10 cards
Use front-end estimation to solve:
45 + 13 =
50
The _____ in a number is the digit with the greatest place value.
a) front-end estimation
b) leading digit
c) rounded
leading digit
47 + 86 =
133
65 - 27 =
38
Rick has $99. He saves another $46. Estimate the amount of money he has now. Round to the nearest 100 or 10s.
About $150
Round to the nearest 10 to solve:
37 + 89 =
130
_________ uses the leading digit to estimate a sum or difference.
a) rounded
b) front-end estimation
c) leading digit
front-end estimation
39 + 96 =
135
98 - 44 =
54
The Drama Club has $416 to spend on the next play. Costumes cost $185. Make-up costs $176. Estimate the total cost of costumes and make-up. Round each number to the nearest 100.
About $400
Round to the nearest 100 to solve:
546 + 223 =
700
438
4 (400)
281 + 532 =
813
574 - 487 =
87
Jennifer has $228. She needs $654 more to buy a TV. Estimate the cost of the TV. Round each number to the nearest 100.
About $900
Estimate:
345 + 233 =
About 500
Identify the leading digit in the following number:
2,875
2 (2,000)
434 + 512 =
946
673 - 154 =
519
In January, Mr. Estrada's water bill is $47. In February, his water bill increased to $89. Estimate how much more his water bill for February was. Round to the nearest 10.
About $40 more
Estimate:
768 + 982 =
About 1,800