Ballpark Estimation
What is the first step of ballpark estimation?
Round each number to the nearest ten
Order these numbers from least to greatest:
23, 68, 54
23, 54, 68
What is 17 rounded to the nearest ten?
20
How do you show the number 46 with base ten blocks?
I I I I ......
What is one less and one more than 62?
One less: 61, one more: 63
Which digit do you check when deciding to round up or down?
The ones place (farthest to the right)
Order these numbers from greatest to least:
73, 44, 87
87, 73, 44
What is 65 rounded to the nearest ten?
70
What number is represented by these base ten blocks:
IIIII ...
53
What is ten less and ten more than 37?
Ten less: 27, ten more: 47
Compare the two numbers below:
76 67
76 > 67
76 is greater than 67
Order these numbers from least to greatest:
26, 22, 84, 79
22, 26, 79, 84
What is 3 rounded to the nearest ten?
0
What is the expanded form of 94?
90 + 4
When you want to find ten more or ten less, which place value chamges?
The tens place
What are the three signs that you use when comparing numbers?
= equal to
> greater than
< less than
Order these numbers from greatest to least:
17, 62, 34, 15
62, 34, 17, 15
What is the rhyme that helps you to remember whether to round up or down?
Four and below let it go, five and above give it a shove
What are the other three ways to show the number fifty three?
53
50 + 3
I I I I I ...
What is ten less and and one less than 24. What is ten more and one more than 24?
Ten less: 14, one less: 23
Ten more: 34, one more: 25
Make sure they have the same number of digits
Order these numbers from least to greatest:
35, 67, 92, 39, 63
35, 39, 63, 67, 92
When you are rounding, what place value do you check?
The ones place (farthest to the right)
What are the four ways to represent a number?
Standard form, expanded form, written form, base ten blocks
What is ten less and and one less than 50. What is ten more and one more than 50?
Ten less: 40, one less: 49
Ten more: 60, one more: 51