At the end of a 45-minute period, the grade four pupils will be able to:
1. Add and subtract fractions with the same denominators,
2. Add and subtract fractions with dissimilar denominators,
3. Add and subtract mixed numbers with similar denominators, and
4. Add and subtract mixed numbers with dissimilar denominators with 75% proficiency level.
II. SUBJECT MATTER
ADDING AND SUBTRACTING OF FRACTIONS
Liking Mathematics in the Grade School: Textbook in Mathematics for Grade-Four by Prepotente et.al.
21st Century Mathematics (6) by Villame et.al.
Power point presentation, visual aids
To add/subtract fractions with similar denominators, we add/subtract the numerator and write the sum/difference over the same denominator.
To add/subtract fractions with dissimilar denominators, first find the smallest equivalent fractions by using the least common multiple (LCD) to rename the dissimilar fractions into similar fractions and then proceed as in adding/subtracting fractions with the same denominator.
To add/subtract mixed numbers with similar denominators, we add/subtract the whole numbers, then the numerators and retain the denominator.
To add/subtract mixed numbers with dissimilar denominators, change dissimilar fractions to similar fractions. Add/subtract the whole numbers, and then the numerators and copy the denominator.
Identifying, adding, subtracting
Small parts are necessary to make-up a whole.
Checking of attendance
Review of the past lesson
Have the children sitting in a circle.
I Bounce the ball to one of your classmate . Then choose another child and bounce the ball over to them, counting the bounces as they move towards them (e.g. 1, 2, 3, 4, 5...). The person they have bounced it to then bounces the ball and goes back to the empty space. As they travel they can either add or subtract the numbers or bounces (e.g. 5, 4, 3... or 6, 7, 8...). C. Lesson proper
Class, do you love to eat chocolates?
Who wants to eat a chocolate?
We’d love to, teacher.
I have here a bar of chocolate and I am going to divide it equally into four Parts. (Slice).So I have now 4 slices or 4/4 of chocolate. (Give the 2/4 of the apple to two pupils, 1/4 each).So I have given Mario ¼ of the chocolate and another ¼ to Rowena. How much chocolate have I given all in all and how
much is left?
2/4 given and 2/4 left,teacher.
Yes Very Good! I sliced the chocolate into four equal parts so we get 4/4 or 1 of course and I gave Mario and Rowena ¼ each of the chocolate. So ¼ + ¼ ,what would be the sum that we get?
2/4 OR 1/2 , teacher.
Yes. Very good, we get 2/4 or ½ and the parts that is left for me is also 2/4 0r ½ . If we are going to add the parts of apple that I have given to Mario and Rowena and the parts left for me, how much will it be all in all?
4/4 or 1,teacher.
Now class, do you have any idea of what will be our topic for today?
Adding and subtracting of fraction
Exactly class. Today, we will be discussing how to add and subtract fractions. And I want you to meet the following objectives which are to: add and subtract fractions with the same denominators, add and subtract fractions with dissimilar denominators,add and subtract mixed numbers with similar denominators, and add and subtract mixed numbers with dissimilar denominators with 75% proficiency...
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