Mathematics 5 - Quarter 1 - Week 8

Mathematics 5

​Quarter 1 - Week 8

​How are you?

Hope you are doing great!

​Let us recall the past lesson.

Multiple Choice

What is the lowest term of  $$\frac{2}{4}$$  ?

• $$\frac{1}{2}$$  

• $$\frac{1}{8}$$  

• $$\frac{1}{4}$$  

• $$\frac{2}{2}$$  

Multiple Choice

What is the lowest term of  $$\frac{6}{9}$$  ​ ?

• $$\frac{6}{3}$$  

• $$\frac{2}{3}$$  

• $$\frac{3}{9}$$  

• $$\frac{3}{6}$$  

Multiple Choice

What is the lowest term of  $$\frac{10}{12}$$  ​ ?

• $$\frac{2}{10}$$  

• $$\frac{5}{6}$$  

• $$\frac{3}{5}$$  

• $$\frac{3}{6}$$  

Multiple Choice

What is  $$\frac{1}{2}\ \times\ \frac{1}{2}$$  ​ ?

• $$\frac{1}{2}$$  

• $$\frac{11}{22}$$  

• $$\frac{1}{4}$$  

• $$\frac{2}{4}$$  

Multiple Choice

What is  $$\frac{2}{5}\ \times\ \frac{1}{3}$$  ​ ?

• $$\frac{1}{2}$$  

• $$\frac{3}{8}$$  

• $$\frac{8}{10}$$  

• $$\frac{2}{15}$$  

​Lesson 1

​Solve Word Problems Involving Multiplication Without or With Addition or Subtraction of Fractions and Whole Numbers

​Lesson 2

Showing the Reciprocal of Fraction

​Solve Word Problems Involving Multiplication Without or With Addition or Subtraction of Fractions and Whole Numbers

  Aling Rena will prepare food for incoming fiesta of their barrio. She allotted budget of ₱3,500.00 for the food that she will cook. She allots 4/7 for purchasing vegetables and 2/7 for fish and the rest is for meat. How much money did she spend for vegetables, fish and meat?

  Aling Rena will prepare food for incoming fiesta of their barrio. She allotted budget of ₱3,500.00 for the food that she will cook. She allots 4/7 for purchasing vegetables and 2/7 for fish and the rest is for meat. How much money did she spend for vegetables, fish and meat?

​What is asked in the problem?

​The total amount spent for vegetables, fish and meat

  Aling Rena will prepare food for incoming fiesta of their barrio. She allotted budget of ₱3,500.00 for the food that she will cook. She allots 4/7 for purchasing vegetables and 2/7 for fish and the rest is for meat. How much money did she spend for vegetables, fish and meat?

What are the given facts?

  Aling Rena will prepare food for incoming fiesta of their barrio. She allotted budget of ₱3,500.00 for the food that she will cook. She allots 4/7 for purchasing vegetables and 2/7 for fish and the rest is for meat. How much money did she spend for vegetables, fish and meat?

What operation should be used?

Multiplication

Maaaring gumamit ng illustration (block model) upang mas makita ang mga bahaging sinabi sa word problem.

Mula sa block model ay makikita agad ang isang bahaging hindi nabanggit sa word problem (ang fraction para sa meat which is 1/7). Mas madali na ang magiging computation dahil dito.

₱

₱

₱

₱

₱

₱

​Note: Gumamit ng Peso sign (₱) kapag may pera nang involved.

Maaari ring i-check ang iyong sagot gamit ang block model.

​500

​500

​500

​500

​500

​500

​500

​A class of 40 pupils. 2/5 of them are boys. How many are girls?

​Among 40 pupils, 2/5 are boys. Ibig sabihin, ang 3/5 ay girls. I-compute lamang ito gamit ang multiplication. (Nakuha ang 3/5 dahil ang fraction para sa 40 ay 5/5. So, 5/5 - 2/5 = 3/5)

Ang sagot ay:

​"There are 24 girls in the class."

Rene had Php 960. He spent 1/3 of his money on food. How many were left to him?

Kapareho lamang ito sa naunang problem. Bukod sa naunang solution, maaari ring i-multiply muna ang Php 960 sa 1/3, tapos ay i-minus ang sagot sa Php 960.

Ang sagot ay:

​"Php 728 was left to Rene."

Magkaiba man ang solution o paraan ng pag-compute, basta naunawaan ang "What is asked?" (nais hanapin sa problem), makaka-come up sa tamang solution at lalabas pa rin ang iisang sagot.

​(At kailangan ding naka-lowest term o simplest form ang sagot.)

​Try to answer these problems.

Multiple Choice

Find the product of 2/5 and 3/4.

• 3/10

• 5/20

Multiple Choice

Efren had 480 apples for sale. He sold 3/5 of them. How many were left?

• 288

• 192

• 6/10

Multiple Choice

Two-fifths of the worker in a factory are men. The rest are women. If there are 28 men, how many more women than men are there?

• 42

• 14

​Showing the Reciprocal of Fraction

​The RECIPROCAL of a fraction is found by inverting the fraction.(multiplicative inverse) These are the numerator and denominator are interchanged. Multiplying a fraction by its reciprocal is equal to 1.

​(Ibig sabihin, pagpapalitin lang ng puwesto ang kung ano ang nasa numerator at denominator ng isang fraction. May ilan lang dapat tandaan kung whole number, 1 ang numerator, o mixed number.)

​Kapag proper o improper fraction, pagpalitin lamang ng puwesto ang nasa numerator at denominator.

​Proper Fraction (2/3)

​Improper Fraction (8/5)

Kapag ang fraction ay 1 ang numerator, magiging whole number ito (dahil hindi na isinusulat ang 1 kapag ito ay nasa denominator).

Kapag naman ito ay whole number, magiging fraction ito na one (1) ang numerator.

Kapag naman mixed number, gawin muna itong improper fraction (multiply the denominator by the whole number, then add the numerator) pagkatapos ay baligtarin.

​Now, let's see if you got it!

​Hope you had fun while learning!

​Until next time! Thank you!