Vocabulary
Answer to an addition problem and a subtraction problem.
sum and difference
Estimate and decide if reasonable.
713 + 118 = 831
yes!
Solve the problem:
116-95=
21
The number 650 is halfway between which two numbers?
a) 65 and 65,000
b) 550 and 650
c) 600 and 700
C
What is a factor?
The numbers being multiplied.
If both addends are rounded up, will the estimate be greater than or less than the actual sum?
greater than
325-213 =
112
Round to the nearest 10
752
750
Name the first 3 place value spots.
ones, tens, hundreds
Round to the nearest ten to estimate.
28 + 46 =
30 + 50 = 80
249 - 187 =
62
There are 293 steps to the top of the Leaning Tower of Pisa in Italy. To the nearest 100, how many steps are there?
300
What is a polygon?
A closed figure made up of straight line segments.
Use compatible numbers to estimate the difference.
328 - 207 =
300 - 200 = 100
Tricia spent $35 on a flower bed, $48 on dirt, and $24 on a watering pail. If she had $110.00, did she have enough money? What was her change?
$107.00
$3.00
Round to the nearest 100
835
Explain your thinking.
800
3 is less than 5 - so it does not round up
What is the Associative Property of Multiplication?
What is another word for associative?
The grouping of factors can be changed and the product will be the same.
Carl practices the piano 45 minutes every day. Today he practiced 15 minutes after school and 10 minutes before dinner. How much time does he still need to practice?
a) 70 minutes c) 60 minutes
b) 35 minutes d) 20 minutes
D
725 - n = 319
What will the value of n be?
n = 406
Jack read 132 pages in one week. Jim read 125 pages in the same week. Who read more pages explain how you know?
Comparing the two boys pages read, 132 is 7 pages more. I used subtraction to find this answer.