Math Basics AF 1.3
Objective - To understand some BASIC rules of mathematics Objective - To reason with diagrams.
The SIGN goes with the TERM! BIG RULES of MATH The SIGN goes with the TERM! No Double Signs!
The SIGN goes with the TERM! Think of EACH TERM individually. Example: 5 + 3 ─ 7 This should NOT be thought of as 5 PLUS 3 MINUS 7 But rather as a POSITIVE 5, a POSITIVE 3, and a NEGATIVE 7
To remove double signs, use the Alien Face. The Alien Face is also used when multiplying or dividing numbers with different signs. ▬
Adding & Subtracting Integers Example: 15 +(– 22) –(–13) – 4 15 – 22 + 13 – 4 Step 1: Get rid of Double signs! Step 2: Circle each term. Remember: The sign goes with the term. Step 3: Put each term in the correct column. Step 4: Add each column. Step 5: Decide winning team Step 6: Determine the spread. (big number – small number) - + 22 15 4 13 26 28 Winning team: + Spread: 28 – 26 2 Answer: +2
Adding & Subtracting Integers Example: 14 – 27 + 5 – 9 Step 1: Circle each term. Remember: The sign goes with the term. Step 2: Put each term in the correct column. Step 3: Add each column. Step 4: Decide winning team Step 5: Determine the spread. (big number – small number) - + 27 14 9 5 36 19 Winning team: – Spread: 36 – 19 17 Answer: – 17
Winning team: NO WINNER A Tie? Example: 13 – 12 + 7 – 8 Step 1: Circle each term. Remember: The sign goes with the term. Step 2: Put each term in the correct column. Step 3: Add each column. Step 4: Decide winning team Step 5: Determine the spread. (big number – small number) A tie means the answer is zero! - + 12 13 8 7 20 20 Winning team: NO WINNER Spread: 20 – 20 Answer: 0
Try These –11 + 2 +(– 5) + 4 4 –(– 8) + 9 – 5 – 3 +(–16) –(+7) –(–13)
Word Problems – OH NO! The temperature at 4 pm Tuesday was 14° Fahrenheit. By 6 am Wednesday, the temperature had dropped 21°. What was the temperature?
Word Problems – OH NO! The temperature at 5 am was -5°F. At 3 pm the temperature raised 12°. What is the temperature at 3pm?
Word Problems – OH NO!
Order of Operations PEMDAS PARENTHESES EXPONENTS MULTIPLICATION or DIVISION (left to right) ADDITION or SUBTRACTION (left to right)
Try these!
Round each number to the place indicated:
Order of Operations: Place Value Chart: PARENTHESES EXPONENTS MULTIPLICATION or DIVISION (left to right) ADDITION or SUBTRACTION (left to right) Place Value Chart: