Elementary Math 3/100
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Created: 2006 09 29 | Percent completed: 
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Contents |
[edit] Lesson 100 
[edit] Math Facts
Worksheet:
[edit] Strands
- Multiply tens with tens
- Multiply decimals (ones with ones)
- Add or subtract whole number from fraction
[edit] Rules for Multiplying tens with tens
eg: 21x12 Write on board, flip sheet, poster, or project on LCD Projector:
Rules for Multiplying tens with tens
- Multiply ones column from right to left
- When multiplying tens, put a 0 in the ones column answer on second row
- Multiply tens column from right to left
- Add
Example:
- 21x12
- 21x2 = 42
- 21x1 = 12 , put 0 in the ons column ---> 120
- 42+120 = 162
[edit] Rules for Multiplying decimals (ones with ones)
eg: 1.2x1.3 Write on board, flip sheet, poster, or project on LCD Projector:
Rules for Multiplying decimals (ones with ones)
- Ignore decimals
- Count places for each number with decimal
- Add places together
- Apply total places to answer
[edit] Add or subtract whole number from fraction
eg: 1.2x1.3 Write on board, flip sheet, poster, or project on LCD Projector:
Add or subtract whole number from fraction
- Bottom number needs to be the same to add or subtract
- Take the bottom number of the fraction and make it bottom #/bottom #
- Multiply bottom #/bottom # with the whole number
- Add or subtract
