Strategy - Western Michigan University
|Strategy: LAP Fractions on Addition and Subtraction of Fractions |
|Appropriate Grade Level: 5th-9th Grade |
|Procedures/Steps: |
|L-ook at the sign and denominator. Make sure the sign is addition or subtraction. Look at the bottom number of your fraction. |
|See if they are the same or different. If they are the same, skip down to “Pick a fraction type,” and pick Type 1. If they are |
|different, then you go to the “Ask yourself the question” step. |
|A-sk yourself the question. Will the smallest denominator divide into the largest denominator an even number of times? If your |
|answer is yes, then you go down to “Pick a fraction type” and pick Type 2. If your answer is no, then go to “Pick a fraction type”|
|and pick Type 3. |
|P-ick your fraction type. |
|Type 1: ¼ + ¾ Bottom number are the same. Its sign is addition or |
|subtraction |
|5. Type 2: 1/6 + ½ Bottom numbers are different and the smallest bottom |
|number will divide into the largest bottom number an |
|even number of times. Its sign is addition or subtraction. |
|6. Type 3: 2/3 + ¾ Bottom numbers are different and the smallest number |
|will not divide into the largest bottom number an even |
|number. Its sign is addition or subtraction. |
|7. Identify denominator Student points to denominator. |
|8. Divide denominator Student is shown two denominators. They divide the |
|smallest denominator into the largest denominator. |
|Comments and/or tips: |
|Allow students to work in pairs for increased comprehension of LAP strategy. |
|The LAP strategy shows that mnemonics can help a student remember the steps to solving a math problem. |
|The use of mnemonics can be used in all content areas when teaching a difficult topic. |
|Students find the LAP strategy easy to use and remember when solving addition and subtraction of fractions. |
|Source: |
|Test, D. W. & Ellis, M. F. (2005). The effects of LAP fractions on addition and |
|subtraction of fractions with students with mild disabilities. Education and Treatment |
|of Children 28(1), 11-24. |
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