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Solve exercises on page 176 of Math 5, Concentrated Practice
Exercise 1 Math 5 page 176 SGK
Problem:
a) 683 x 35; 1954 x 425 ; 2438 x 306 ;
b) 7/9 x 3/35; 9/22 x 55; 11/17 : 33/34
c) 36.66 : 7.8 ; 15.7 : 6.28 ; 27.63 : 0.45 ;
d) 16 hours 15 minutes : 5 ; 14 minutes 36 seconds : 12
Solution:
a) 683 x 35 = 23905
1954 x 425 = 830450
2438 x 306 = 746028
b)
Exercise 2 Math 5 page 176 SGK
Problem:
Find x:
a) 0.12 x x = 6 ; b) x : 2.5 = 4 ;
c) 5.6 : x = 4 ; d) x x 0.1 = 2/5 ;
Solution:
a) 0.12 x x = 6
x = 6 : 0.12
x = 50.
b) x : 2.5 = 4
x = 4 x 2.5
x = 10.
c) 5.6 : x = 4
x = 5.6 : 4
x = 1.4
d) x x 0.1 = 2/5
x = 2/5 : 0.1
x = 2/5 : 1/10
x = 2/5 x 10/1 = 20/5 = 4
Chapter 1 introduces measurement units, including Hectometer, Deciliter, and Hectare, as essential knowledge. Check out tips for Math 5 page 30 to excel in 5th-grade Math.
In addition to the learned content, students should prepare for the upcoming lesson on Multiplying a decimal by a natural number with the section Multiplying a decimal by a natural number to master their 5th-grade Math skills.
Exercise 3 Math 5 page 176 SGK
Problem:
Over three days, a store sold 2400kg of sugar. On the first day, it sold 35% of that amount, on the second day 40%. How much kilogram of sugar did the store sell on the third day?
Solution:
The kilogram of sugar sold on the first day is:
2400 x 35 : 100 = 840 (kg)
The kilogram of sugar sold on the second day is:
2400 x 40 : 100 = 960 (kg)
The kilogram of sugar sold on the third day is:
2400 – (840 + 960) = 600 (kg)
=> Answer: 600kg of sugar.
Exercise 4 Math 5 page 176 SGK
Problem:
A fruit store made 1,800,000 VND in profit. Calculate the capital invested if the profit is 20% of the buying amount.
Solution:
Consider the buying amount as 100%. The buying amount is:
100% + 20% = 120% (buying amount)
The capital invested to buy the fruits is:
1800000 : 120% = 1500000 (VND)
=> Answer: 1500000 VND
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