Solve exercises on pages 172 and 173 in Math 3 textbook.

Solution to Exercise 1 on page 172 of Math 3 Textbook

Problem:

Identify the letter before the correct answer to 7m 3cm =

A. 73cm B. 703cm

C. 730cm D. 70003cm

Answer:

I have transformed:

7m3cm = 700 + 3 = 703 cm

So the correct answer is: B. 703 cm

Solution to exercise 2 page 173 Math 3 Textbook

Problem:

Observe the picture below and answer the following questions

a) How much does the orange weigh?

b) How much does the papaya weigh?

c) How many grams heavier is the papaya compared to the orange?

Answer:

Observing the picture, we can see:

a) The orange weighs 300g (200 + 100 = 300 g)

b) The papaya weighs 700g (500 + 200 = 700g)

c) The papaya is 400 grams heavier than the orange (700 - 300 = 400g)

Solution to exercise 3 page 173 Math 3 Textbook

Problem:

Lan leaves home at 7:05 a.m. She arrives at school at 7:10 a.m.

a) Attach additional minute hands to the clocks

b) How many minutes does Lan take from home to school?

Answer:

a) Add extra minute hands to the clocks

b) It takes Lan 15 minutes to go from home to school.

Solution to exercise 4 page 173 Math 3 Textbook

Problem:

Binh has two 2000-dong bills. He buys a pencil for 2700 dong. How much money does Binh have left?

Answer:

Binh has a total of:

2000 x 2 = 4000 (dong)

After buying the pencil, Binh has the remaining amount of:

4000 - 2700 = 1300 (dong)

Answer: 1300 dong