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Product-Training-Manuals

Published on June 15, 2007

Author: Malbern

Source: authorstream.com

Addition & Subtraction of Decimals:  Addition andamp; Subtraction of Decimals by Doug McFarland Horizon Academy Roeland Park, Kansas www.horizon-academy.com Add and Subtract like Columns:  Add and Subtract like Columns 71 + 58 + 25 = _______ 4 1 15 RULE: Only add and subtract LIKE columns. Slide3:  7.1 + 5.8 + 2.5 = _______ Add andamp; Subtract like Columns . 4 1 15 RULE: Only add and subtract LIKE columns. The “Understood” Decimal:  The 'Understood' Decimal Consider the whole number 15 15 = 1 ten + 5 ones (10 + 5). We could put a decimal to separate the whole number from the decimal. 15.0 There is NO value in the tenths column, so we put 0 (zero). Addition with the “Understood” Decimal:  Addition with the 'Understood' Decimal If you were adding 15 + 12 you could write the problem 15.0 + 12.0 15.0 + 12.0 = 27.0 or 27 When there is no decimal value, the zero and the decimal are NOT written, but they are understood to still be there. Make The Columns Even:  Make The Columns Even 34.5 + 21 + 8.5 .0 34.5 21.0 8.5 + RULE: Add zeros to even the columns Make The Columns Even:  Make The Columns Even 44.589 + 7.23 + 5 56.819 1 1 7 23 0 5 000 Subtracting Decimals:  Subtracting Decimals Remember how to even your columns. Remember the 'understood' .0 when looking at a whole number like 7 It could be 7.0 or 7.00 if needed. In subtraction, it will be needed. Let’s Look at Subtraction:  Let’s Look at Subtraction 34 – 12 = _____ Subtract Similar Columns:  Subtract Similar Columns 34 – 1.2 = _____ RULE: Only add and subtract LIKE columns. Subtract Similar Columns:  Subtract Similar Columns 34 – 1.2 = _____ 1 8 2 3 Here’s a Tricky One:  Here’s a Tricky One 8 - 3.56 = _______ .00 5.56 1 1 4. 4 4 We’re Done!:  We’re Done! Nice job following along in the lesson! Try to use what you learned in your work! Doug McFarland ©2006

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