pre-algebra 2.11 2.12 subtracting decimals
Post on 18-Dec-2014
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Pre-Algebra
Lesson 2.11, 2.12
Subtracting Decimals, Part 1 & 2
By stating the objectives for the lesson, retention increases by 24%!
Did you know that...
Rules:
Same sign (+ +, - -)
add numbers together, keep sign
Different signs (+ - , - +)
find difference, take sign of higher number
Review of Adding Decimals:
Review of Adding Decimals:
Review of last week:
What is subtraction?
=
=
You can turn any subtraction problem into an addition problem:
6 - 4
-9 - 13
8 - -3
-14 - (-5)
1.# - #
2. - # - #
3. # - (-#)
4. -# - (-#)
1) - 43.4 + x = 15.34 2) x + 19.2 = -19.9
3) x - 98.3 = -12.3 4) x + 55.33 = 23.2
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