Textbook Solution and Answer

Page No. 47

Question 1

Measure the objects shown in the picture and write their lengths.

Answer:

• Eraser = 2 4/10 cm
• Pencil = 4 5/10 cm = 4½ cm
• Chalk = 1 4/10 cm

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Page No. 49

Question 2

Arrange the following lengths in ascending order.

(a) 9/10

(b) 1 7/10

(c) 130/10

(d) 13 1/10

(e) 10 5/10

(f) 7 6/10

(g) 6 7/10

(h) 4/10

Answer:

4/10, 9/10, 1 7/10, 6 7/10, 7 6/10, 10 5/10, 130/10, 13 1/10

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Page No. 50

Question 3

Arrange these lengths from the smallest to the largest.

• 4 1/10
• 4/10
• 41/10
• 41 1/10

Answer:

4/10, 41/10 (= 4 1/10), 41 1/10

Question 1

The lengths of different parts of a honeybee are given below. Calculate the total length of the honeybee.

Body Part	Length
Head	$2\frac{3}{10}$2103​ units
Thorax	$5\frac{4}{10}$5104​ units
Abdomen	$7\frac{5}{10}$7105​ units

Answer:

Total length

= $2\frac{3}{10}+5\frac{4}{10}+7\frac{5}{10}$2103​+5104​+7105​

= $15\frac{2}{10}$15102​ units

Answer: 1521015\frac{2}{10}15102​ units

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Page No. 52

Question 2

The length of a Celestial Pearl Danio is $2\frac{4}{10}$2104​ cm, while the length of a Philippine Goby is $\frac{9}{10}$109​ cm. Find the difference between their lengths.

Answer:

Difference

= $2\frac{4}{10}-\frac{9}{10}$2104​−109​

= $1\frac{5}{10}$1105​ cm

Answer: 15101\frac{5}{10}1105​ cm

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Question 3

Observe each number pattern carefully. Identify the rule used in the sequence and complete it.

(a)

4, $4\frac{3}{10}$4103​, $4\frac{6}{10}$4106​, _____, _____, _____

Answer:

$4\frac{9}{10},\;5\frac{2}{10},\;5\frac{5}{10},\;5\frac{8}{10}$4109​,5102​,5105​,5108​

Pattern: Add $\frac{3}{10}$103​ each time.

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(b)

$8\frac{2}{10},\;8\frac{7}{10},\;9\frac{2}{10},$8102​,8107​,9102​, _____, _____, _____, _____

Answer:

$9\frac{7}{10},\;10\frac{2}{10},\;10\frac{7}{10},\;11\frac{2}{10}$9107​,10102​,10107​,11102​

Pattern: Add $\frac{5}{10}$105​ each time.

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(c)

$7\frac{6}{10},\;8\frac{7}{10},$7106​,8107​, _____, _____, _____, _____

Answer:

$9\frac{8}{10},\;10\frac{9}{10},\;12,\;13\frac{1}{10}$9108​,10109​,12,13101​

Pattern: Add $1\frac{1}{10}$1101​ each time.

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(d)

$5\frac{7}{10},\;5\frac{3}{10},$5107​,5103​, _____, _____, _____, _____

Answer:

$4\frac{9}{10},\;4\frac{5}{10},\;4\frac{1}{10},\;3\frac{7}{10}$4109​,4105​,4101​,3107​

Pattern: Subtract $\frac{4}{10}$104​ each time.

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(e)

$13\frac{5}{10},\;13,\;12\frac{5}{10},$13105​,13,12105​, _____, _____, _____

Answer:

12,;11$\frac{5}{10}$105​,;11,;10$\frac{5}{10}$105​

Pattern: Subtract $\frac{5}{10}$105​ each time.

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(f)

$11\frac{5}{10},\;10\frac{4}{10},\;9\frac{3}{10},$11105​,10104​,9103​, _____, _____, _____

Answer:

$8\frac{2}{10},\;7\frac{1}{10},\;6$8102​,7101​,6

Pattern: Subtract $1\frac{1}{10}$1101​ each time.

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Page No. 53

Question 4

How many one-hundredths are equal to one-tenth? Can the measurement also be written as 4 units and 45 one-hundredths?

Answer:$$\frac{1}{10}=\frac{10}{100}$$101​=10010​

Therefore,

10 one-hundredths make one-tenth.

Yes.$$4+\frac{45}{100}=4.45$$4+10045​=4.45

So, the measurement can also be read as 4 units and 45 one-hundredths.

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Page No. 54

Question 5

Look at the number line. Write the missing measurements shown in the empty boxes.

Answer:

• $\frac{55}{100}$10055​
• $\frac{155}{100}$100155​
• $\frac{174}{100}$100174​
• $\frac{202}{100}$100202​
• $\frac{240}{100}$100240​

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Question 6

Write each measurement shown below and read it in words.

(a)

Measurement$$5\frac{37}{100}$$510037​

In words

Five and thirty-seven hundredths

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(b)

Measurement$$15\frac{3}{100}$$151003​

In words

Fifteen and three hundredths

age No. 55

Question 1

Write the following measurements in words.

(a)

Measurement: $7\frac{52}{100}$710052​

Answer: Seven and fifty-two hundredths

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(b)

Measurement: $9\frac{80}{100}$910080​

Answer: Nine and eighty hundredths

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Question 2

In each set of measurements given below, identify the longest and the shortest length. Then mark all the measurements on the given scale.

(a)

Answer:

• Longest: $\frac{33}{100}$10033​
• Shortest: $\frac{3}{100}$1003​

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(b)

Answer:

• Longest: $3\frac{1}{10}$3101​
• Shortest: $1\frac{3}{10}$1103​

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(c)

Answer:

• Longest: $\frac{54}{100}$10054​
• Shortest: $\frac{4}{10}$104​

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(d)

Answer:

• Longest: $3\frac{66}{100}$310066​
• Shortest: $3\frac{6}{100}$31006​

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Page No. 56

(e)

Answer:

• Longest: $1\frac{8}{100}$11008​
• Shortest: $\frac{9}{100}$1009​

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(f)

Answer:

• Longest: $7\frac{5}{100}$71005​
• Shortest: $7\frac{3}{10}$7103​

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(g)

Answer:

• Longest: $6\frac{65}{100}$610065​
• Shortest: $5\frac{7}{100}$51007​

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Page No. 58

Figure It Out

Find the following sums and differences.

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(a)

$$\frac{3}{10}+3\frac{4}{100}$$103​+31004​

Answer$$3\frac{34}{100}$$310034​

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(b)

$$9\frac{57}{100}+2\frac{13}{100}$$910057​+210013​

Answer$$11\frac{70}{100}$$1110070​

or$$11\frac{7}{10}$$11107​

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(c)

$$15\frac{64}{100}+14\frac{36}{100}$$1510064​+1410036​

Answer$$30$$30

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(d)

$$7\frac{7}{100}-4\frac{4}{100}$$71007​−41004​

Answer$$3\frac{3}{100}$$31003​

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(e)

$$8\frac{6}{100}-5\frac{3}{100}$$

Answer$$3\frac{3}{100}$$

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(f)

$$12\frac{62}{100}-\frac{99}{100}$$

Answer$$11\frac{63}{100}$$

Page No. 63

Question 1

Draw a place value table like the one shown in the textbook. Write each quantity in decimal form, express it using place values, and read the decimal aloud.

Answer

Question	Place Value	Decimal Form	Read As
(a) 2 ones, 3 tenths and 5 hundredths	$2+\frac{3}{10}+\frac{5}{100}$2+103​+1005​	2.35	Two and thirty-five hundredths
(b) 1 ten and 5 tenths	$10+\frac{5}{10}$10+105​	10.5	Ten and five tenths
(c) 4 ones and 6 hundredths	$4+\frac{6}{100}$4+1006​	4.06	Four and six hundredths
(d) 1 hundred, 1 one and 1 hundredth	$100+1+\frac{1}{100}$100+1+1001​	101.01	One hundred one and one hundredth
(e) 9 tenths and 8 hundredths	$\frac{9}{10}+\frac{8}{100}$109​+1008​	0.98	Ninety-eight hundredths
(f) 5 hundredths	$\frac{5}{100}$1005​	0.05	Five hundredths
(g) 1 tenth	$\frac{1}{10}$101​	0.1	One tenth

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(h)

Express the following quantities in decimal form.

• $2\frac{1}{100}$21001​
• $4\frac{1}{10}$4101​
• $7\frac{7}{1000}$710007​

Answer

Quantity	Decimal Form	Read As
$2\frac{1}{100}$21001​	2.01	Two and one hundredth
$4\frac{1}{10}$4101​	4.1	Four and one tenth
$7\frac{7}{1000}$710007​	7.007	Seven and seven thousandths

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Combined Decimal

$$2.01+4.1+7.007=13.117$$2.01+4.1+7.007=13.117

Answer: 13.117

Read as:

Thirteen and one hundred seventeen thousandths.

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Page No. 64

Question 2

Write the following quantities in decimal notation.

(a)

234 hundredths

Answer$$\frac{234}{100}=2.34$$100234​=2.34

Decimal Form: 2.34

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(b)

105 tenths

Answer$$\frac{105}{10}=10.5$$

Decimal Form: 10.5