Esme's Place Value Study Guide
- 2. What is Place Value? Place value is the value or amount of a single digit of a number. This includes Integers, Percentages, Decimals, Fractions, Ones, Tens, Thousands etc.
- 3. What is an Integer? An integer is a whole number, not a Decimal, Fraction or Percentage. Usually it just means a negative or positive number.
- 4. What is a Positive Number or a Negative Number? Positive Numbers A positive number is a number above zero on the number line. Negative Numbers A negative number is a number below zero on the number line. If there is a - sign in front it is a negative number (-9).
- 5. What is Absolute Value? The amount or value from the number 0, ignoring the integer signs (- or +). So -9 and +9 have the same absolute value which is 9!
- 6. Adding and Subtracting Integer Explanations
- 7. Adding Integers 1 How to add positive and a negative? If you have a problem like 8 + -9 you subtract instead or add, so change the symbol from adding to subtracting. Also change the negative into a positive. So 8 + -9 would be 8 - 9. Than just subtract normally. If the If the number after - is bigger than the first number than the sum is a negative number.
- 8. Adding Integers 2 How to add Negative and a Positive? Adding a negative and a positive looks like -9 + 8. If the second number is bigger than the first number the sum is a positive, if the second number is smaller than the sum is a negative. So -9 + 8 = negative. To solve the problem you go the amount of the second number to the right on the number line (If you have -9 + 8, you go 8 numbers to the right). Than what number you end up is the answer!!! So -9 + 8 = -1
- 9. Adding Integers 3 How to add 2 negatives? Example: -8 + -9 Remember this, negative plus negative equals negative. First change the negatives into positives. Then just add normally, after you have the sum put a negative sign in front, so -8 + -9 = -17
- 10. Subtracting Integers 1 How to subtract positive with a negative? If you have a problem like 8 - -9 you actually add instead of subtracting. So change the subtract (-) symbol into a adding sign(+). Then you change the negative into a positive. The problem should end up looking like this (8 + 9). Then just add normally!
- 11. Subtracting Integers 2 How to subtract a negative and a positive? If you have a problem like -9 - 8, this is how you do it. First you need to know that the answer is always a negative. First change the negative into a positive, also don’t subtract you should add. Then add normally, when you have the sum change it to a negative. (Example if the cum is 17, change to -17) So -9 - 8 = -17
- 12. Subtracting Integers 3 How to subtract 2 negatives? A problem like -2 - -2 equals either a negative or a positive. First change the second number into a positive. Also don’t subtract, you add. Then add, -2 + 2 = 0. Hint go to the right when using the number line.
- 13. Thank You!