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### Transcript

• 1. Adding and Subtracting Decimals
•  Find the decimal
• Line up decimals
• Fill in empty spots with zeros
• It’s that easy!!!!!!!
• 3. Let’s try some!!!
• 56.78 + 1.3 = z
• 58.08 = z
• 56.78
• +1.30
• 58.08
• 4.
• 45.6 – 3.784 = z
• 41.816 = z
• (Don’t forget to line up decimals)
• That’s the rule!!!!
• 45.600
• -3.784 (Don’t forget to borrow)
• 41.816
• 5.
• 45.8 + 23 = z
• 68.8 = z
• OH!! We need to find the decimals!!!!!
• The 23 needs a decimal.
• It is located behind the 3 (23.)
• 45.8
• +23.0
• 68.8
• 6.
• 78 – 3.567 = z
• 74.433 = z
• OH!!!! We need a decimal for the 78.
• Don’t forget, it is located behind the last digit (78.)
• Line up decimals, fill in with zeros and subtract.
• 78.000
• -3.567
• 74.433
• 7. Don’t forget integers rules!!
• If signs are the SAME,
• ADD and keep the sign.
• If the signs are DIFFERENT,
• SUBTRACT and keep sign of larger absolute value.
• Subtraction Rule
• 8.
• -89.23 + 132. 8 = z
• 43.57 = z
• Should we add or subtract?
• Subtract, because the signs are different.
• 132.80 (put it first because it has the larger absolute value)
• -89.23
• 43.57 (answer will be positive)
• 9.
• -89.45 – 34 = z (need to add opposite)
• -89.45 + (-34) = z
• -123.45 = z
• Should we add or subtract?
• (Add, because the signs are the same)
• (OH!!!! Where is the decimal in the 34? We need it!!!!)
• 89.45
• + 34.00
• 123.45
• This answer will be negative, because both decimals are negative.
• 10.
• 56.23 – (-34.2) + 45.365 – 100 = z
• ( 56.23 + 34.2 ) + 45.365 + (-100) = z (add Opposite)
• ( 90.43 + 45.365 ) + (-100) = z
• ( 135.795 + (-100) ) = z
• 35.795 = z
• 56.23 90.430 135.795
• +34.20 +45.365 - 100.000
• 90.43 135.795 35.795
• 11. Now It’s your turn!!!
• Good luck with your assignment.
• Be sure to complete all problems.
• Please do not use a calculator.