Place Value
How many digits are in this number? 57,326
Five
How do we know whether to round up or leave it the same? What is the rule?
If it is 5 or more let it soar, four or less let it rest
What is the rule to use compensation what solving addition equations?
"Whatever you do to the top, you do the opposite to the bottom."
After adding the front digits, what is the next step immediately after?
Fill in the remaining spaces with zeros
What is a variable?
A letter used to represent an unknown amount
In the number 57,326 which digit is in the hundreds place?
3
True or false: 152 rounded to the nearest hundred is 200.
True, because the 5 in the tens place tells us we need to round up to 200.
True or false: Compensation does not work with subtraction. Feel free to try an example to see.
True
After adding the front digits and filling in the remaining spaces, is this the rough estimate or the adjusted estimate?
This is the rough estimate. We need to round the other digits to adjust, or get a more precise estimate.
If I am solving for how many eggs I need to use in the recipe, what variable could I use to represent this unknown amount?
E for eggs
What is the value of the number 7 in 57,326?
7,000
What is 12,839 rounded to the nearest thousand?
13,000
Use compensation to solve this equation. 34+41=?
30+45=75
True
Find the value of y in this equation. y+4=20
y=16
What is the difference between place and value?
Place includes hundreds, tens, and ones. Value is what the number represents (300...)
Write this equation. Then estimate the sum by rounding each number. 1,462 + 783 = ? You can round to any place.
Thousands: 1,000+1,000=2,000
Hundreds: 1,500+800=2,300
Tens:1,460+780=2,240
Use compensation to solve this equation. 152+68=?
150+70=220
Use front-end estimation to solve this equation. 4,362+8,254+1,275=?
I will check your work.
Find the value of x in this equation. 16-x=11
x=5
Write 57,326 in expanded form.
50,000+7,000+300+20+6
Write this equation. Then estimate the difference by rounding each number. 1,462 - 783 = ? You can round to any place.
Thousands: 1,000-1,000=0
Hundreds: 1,500-800=700
Tens: 1,460-780=680
Use compensation to solve this equation. 356+427=?
360+423=783
Use front-end estimation to solve this equation. 6,843+2,471+2,394=?
I will check your work.
What is the difference between an equation and an expression? (Hint: An expression is missing something.)
An expression does not have an equals sign, while an equation does.