Lesson 11
Subtraction of fractions
Objective: To compare and order fractional numbers through
various interpretations, resources, and representations.
Keywords: Fractions, numerator, denominator, subtraction, least common multiple (LCM), homogeneous, and heterogeneous fractions.
Vocabulary
|
Nº |
English |
Spanish |
|
|
|
|
|
1 |
Crosswise (multiply in crosswise) |
En cruz (multiplicar en cruz) |
|
2 |
Denominator |
Denominador |
|
3 |
Different |
Diferente |
|
4 |
Equal |
Igual |
|
5 |
Each |
Cada |
|
6 |
Easy |
Fácil |
|
7 |
Five twenties (5/20) |
Cinco veinteavos |
|
8 |
Find |
Encontrar |
|
9 |
Homogeneous |
Homogénea |
|
10 |
Heterogeneous |
Heterogénea |
|
11 |
Identify |
Identificar |
|
12 |
Keep |
Mantener, conservar |
|
13 |
Least common multiple (LCM) |
Mínimo común múltiplo (mcm) |
|
14 |
Must |
Deber |
|
15 |
Numerator |
Numerador |
|
16 |
On the top |
En la parte superior |
|
17 |
One half (1/2) |
Un medio |
|
18 |
One third (1/3) |
Un tercio |
|
19 |
Proper |
Propia |
|
20 |
Reduce |
Reducir |
|
21 |
Subtract |
Restar |
|
22 |
Subtraction |
Resta |
|
23 |
Subtracting |
Restar |
|
24 |
Smaller |
Mas pequeño |
|
25 |
Simplifying |
Simplificación |
|
26 |
Same |
Mismo |
|
27 |
Take |
Tomar |
|
28 |
There is, there are |
Hay |
|
29 |
Through |
A través de, por medio de |
|
30 |
Eight fifths (8/5) |
Ocho quintos |
|
31 |
Whole number |
Número entero |
Lesson Plan Nº11 - English version
Lesson Plan Nº11 - Spanish version
Let’s learn about: Subtraction of fractions.
For subtracting fractions, remember that there are two types of
fractions: Homogeneous
and Heterogeneous
Homogeneous
Fractions
Fractions are homogeneous when they have the same denominator.
Example:
Heterogeneous
Fractions
Fractions are heterogeneous when they have a different denominator.
Example
For subtracting fractions, it is important to identify the type of the
fraction. Pay attention to these examples:
Subtraction
of Homogeneous Fractions
To subtract
homogeneous fractions, you subtract the numerators and keep the same
denominator.
For example:
Subtraction
of Heterogeneous Fractions.
To subtract heterogeneous fractions, you must follow these steps.
Example:
Step Nº 1: Take the denominators, and find the least common
multiple (L.C.M).
The least
common multiple of 5
and 2 is 10. We take this number and write the new
denominator.
Step Nº 2: Multiply the numerator with the denominator crosswise.
Step Nº 3: Subtract the numerators and keep the denominator.
And, this is the answer:
Video Nº1- Subtraction of homogeneous fractions.
Video Nº2- Subtraction of heterogeneous fractions.
Let’s practice!
Activity Nº1
Identify whether the following fractions are: Homogeneous or Heterogeneous.
.
Activity Nº 2
Watch the following subtractions and find the answer by matching each fraction with its pair.
Activity Nº 3
Reduced the fractions to the common denominator. Choose the correct option.
