Chapter 10: Tenths and Hundredths

Yes, I have seen notes and coins used in Australia.

The money of England will cost the most in Indian Rupees.

(B) Mithun’s uncle in America had sent him 10 US dollars as a gift. Mithun used 350 rupees for a school trip. How much money was left with him?

Money given to Mithun by his uncle = 10 US Dollars

We know that 1 US Dollar = 39.70

So, the money received by Mithun = 10 × 39.70

It can be written as

= 10 × 39 + 10 × 0.70

= 390 + 7

= Rs 397

Money used by Mithun for a school trip = Rs 350

So, the money left with him = 397 – 350 = Rs 47

NCERT Textbook Page No. – 144

(C) Majeed’s father is working in the U.A.E. He gets 1000 Dirham as his salary. Arun’s father, who is working in Sri Lanka, gets 2000 Sri Lankan Rupees. Who gets more Indian rupees as salary?

Salary of Majeed’s father = 1000 Saudi Riyal

We can write it as

= 1000 × 10.52

By further calculation,

= 1000 × 10 + 1000 × 0.52

So, we get

= 1000 + 520

= Rs 10520

Salary of Arun’s father = 2000 Sri Lankan Rupees

We can write it as

= 2000 × 0.37

By further calculation,

= 2000 × 37 paise

= 74000 paise

= Rs 740

Therefore, Majeed’s father gets more Indian rupees.

(D) Leena’s aunty brought a present for her from China. It cost 30 Yuan. Find what it costs in Indian rupees.

Cost of the gift given to Leena = 30 Yuan

We know that 1 Yuan = Rs 5.50

It can be written as

= 30 × 5.50

So, we get

= 30 × 5 + 30 × 0.50

= 150 + 15

= Rs 165

(E) Astha wants some Hong Kong Dollars and Won.

1. We know that 1 won = Re 0.04

By multiplying both sides by 100,

100 won = 4

Therefore, Astha gets 100 won for Rs 4.

So, for Rs 400, she gets

100 × 100 = 10000 Won

2. We know that 1 HK Dollar = Rs 5.10

It can be written as

= 5 rupees 10 paise

= 5 × 100 + 10 paise

= 500 + 10

= 510 paise

So, the total money with Astha = Rs 508

We can write it as

= 508 × 100

= 50800 paise

Here,

50800 paise = 50490 + 310 paise

By further calculation,

= 510 × 99 + 310 paise

= 510 HKD + 310 paise

We get

310 paise = 300 paise + 10 paise

= 3 rupees 10 paise

= Rs 3. 10

Therefore, Astha can change 99 HK Dollars for Rs 508, and Rs 3.10 is left with her.

Mumbai had the highest temperature at 3 pm.

Srinagar was the coolest place at that time.

The temperature in Mumbai was (35.1 – 8.1) ^o C = 27^o C higher from that in Srinagar.

The temperature in Thiruvananthapuram should rise 40^o C – 33.5^o C = 6.5^o C to reach 40^oC.

The temperature in Kolkata is 29.9^o C – 26.6^o C = 3.3^o C lower from that in Chennai.

(a) Srinagar had the lowest temperature at 3 am.

1.3^o C temperature means it would be cold, and water would be frozen to ice. People living there should wear woollen clothes and sit near the fire to keep themselves warm.

(b) The difference in temperature in Chennai is given below.

Temperature at 3 pm = 29.9^o C

Temperature at 3 am = 21.1^o C

So, the difference = 29.9 – 21.1 = 8.8^o C

The difference in temperature in Bhopal is given below.

Temperature at 3 pm = 25.9^o C

Temperature at 3 am = 9.8^o C

So, the difference = 25.9 – 9.8 = 16.1^o C