12 Part 1: The World of Numbers
CHECK POINT
Round each number to the specified place.- 942 to the nearest hundred
- 29,348 to the nearest ten-thousand
- 1,725,854 to the nearest hundred-thousand
- 1,725,854 to the nearest thousand
- 1,725,854 to the nearest million
The Least You Need to Know
- Our number system is a place value system based on powers of ten.
- As you move to the left, the value of each place is multiplied by 10.
- An exponent is a small number written to the upper right of a base number.
The exponent tells you how many of the base number to multiply together. - Scientific notation is a system of writing large numbers as a number between 1
and 10 multiplied by a power of 10. - Round a number to a certain place by looking at the next place, rounding up if the
next digit is 5 or more and down it’s 4 of less.