Chapter 2 भिन्न एवं दशमलव Ex 2.6

प्रश्न 1.
ज्ञात कीजिए-
(i) 0.2 x 6
(ii) 8 x 4.6
(iii) 2.71 x 5
(iv) 20.1 x 4
(v) 0.05 x 7
(vi) 211.02 x 4
(vii)2 x 0.86
यहाँ सादा गुणा करने के पश्चात् दोनों संख्याओं में दशमलव बिन्दु के दाहिनी ओर अंक गिनकर दशमलव बिन्दु लगाएँगे।
हल:
(i) 0.2 x 6
∵ 2 x 6 = 12,
∴ 0.2 x 6 = 1.2

(ii) 8 x 4.6 ,
∵ 8 x 46 = 368
∴ 8 x 46 = 36.8

(iii) 2.71 x 5
∵ 271 x 5 = 1355;
∴ 2.71 x 5 = 13.55

(iv) 20.1 x 4
∵ 201 x 4 = 804
∴ 20.1 x 4 = 80.4

(v) 0.05 x 7
∵ 5 x 7 = 35
∴ 0.05 x 7 = 0.35

(vi) 211.02 x 4
∵ 21102 x 4 = 84408
∴ 211.02 x 4 = 844.08

(vii) 2 x 0.86
∵ 2 x 86 = 172
∴ 2 x 0.86 = 1.72

प्रश्न 2.
एक आयत का क्षेत्रफल ज्ञात कीजिए जिसकी लम्बाई 5.7 cm और चौड़ाई 3 cm है।
हल:
लम्बाई = 5.7 cm, चौड़ाई = 3 cm.
आयत का क्षेत्रफल = लम्बाई x चौड़ाई
= 5.7 x 3 = 17.1 cm2

प्रश्न 3.
ज्ञात कीजिए-
(i) 1.3 x 10
(ii) 36.8 x 10
(iii) 153.7 x 10
(iv) 168.07 x 10
(v) 31.1 x 100
(vi) 156.1 x 100
(vii) 3.62 x 100
(viii) 43.07 x 100
(ix) 0.5 x 10
(x) 0.08 x 10
(xi) 0.9 x 100
(xii) 0.03 x 1000
हल:
(i) 1.3 x 10 = 13
(ii) 36.8 x 10 = 368
(iii) 153.7 x 10 = 1537
168 : 07 x 10 = 1680.7
31.1 x 100 = 3110
(vi) 156.1 x 100 = 15610
(vii) 3.62 x 100 = 362
(viii) 43.07 x 100 = 4307
(ix) 0.5 x 10 = 5
(x) 0.08 x 10 = 0.8
(xi) 0.9 x 100 = 90
(xii) 0.03 x 1000 = 30
नोट – किसी संख्या को 10, 100 व 1000 से गुणा करने के लिए उसी संख्या को लिखकर दशमलव बिन्दु को दायीं ओर उतने ही अंक विस्थापित करते हैं जितने शून्य होते है।

प्रश्न 4.
एक दुपहिया वाहन एक लीटर पैट्रोल में 55.3 km की दूरी तय करता है। 10 लीटर पैट्रोल में वह कितनी दूरी तय करेगा ?
हल:
∵ 1 लीटर पैट्रोल में तय की गई दूरी = 55.3 km
∴ 10 लीटर पैट्रोल में तय की गई दूरी = 55.3 x 10 km = 553 km

प्रश्न 5.
ज्ञात कीजिए-
(i) 2.5 x 0.3
(ii) 0.1 x 51.7
(iii) 0.2 x 316.8
(iv) 1.3 x 3.1
(v) 0.5 x 0.05
(vi) 11.2 x 0.15
(vii) 1.07 x 0.02
(viii) 10.05 x 1.05
(ix) 101.01 x 0.01
(x) 100.01 x 1.1
हल:
(i) 2.5 x 0.3
∵25 x 3 = 75
∴2.5 x 0.3 = 0.75
10, 100 और 1000 से भाग

(ii) 0.1 x 51.7
∵1 x 517 = 517
∴0.1 x 51.7 = 5.17

(iii) 0.2 x 316.8

MP Board Class 7th Maths Solutions Chapter 2 भिन्न एवं दशमलव Ex 2.6 1
∴ 0.2 x 316.8 = 63.36

(iv) 13 x 3.1
MP Board Class 7th Maths Solutions Chapter 2 भिन्न एवं दशमलव Ex 2.6 1a
∴ 1.3 x 3.1 = 4.03

(v) ∵5 x 5 = 25
∴0.5 x 0.05 = 0.025

(vi) 11:2 x 0.15
MP Board Class 7th Maths Solutions Chapter 2 भिन्न एवं दशमलव Ex 2.6 1b
∴ 11:2 x 0.15 = 1.68

(vii) 107 x 2 = 214
∴ 1.07 x 0.02 = 0.0214

(viii) 10.05 x 1.05
MP Board Class 7th Maths Solutions Chapter 2 भिन्न एवं दशमलव Ex 2.6 1c
∴1005 x 1.05 = 10.5525

(ix) ∵ 10101 x 1 = 10101
∴ 101.01 x 0.01 = 1:0101

(x) ∵ 10001 x 11 = 110011
∴100.01 x 1.1 = 110.011

पाठ्य-पुस्तक पृष्ठ संख्या # 53

प्रश्न
टुकड़ों की संख्या होगी। क्या यह सही है ?
उत्तर:
हाँ, यह सही है।

निम्न सारणी को पूरा कीजिए-
231.5 ÷ 10 = 23.15
231.5 ÷ 100 = 2:315
231.5 : 1000 = 0.2315

1.5 ÷ 10 = 0.15
1.5 ÷ 100 = 0.015
1.5 ÷ 1000 = 0.0015

29.36 ÷ 100 = 0:2936
29.36 ÷ 1000 = 0.02936
29.36 ÷ 10 = 2.936
नोट – किसी संख्या को 10, 100 व 1000 से भाग देने पर भागफल में दशमलव बिन्दु बायीं ओर उतने स्थान ही विस्थापित हो जाता है जितने 1 के साथ शून्य होते हैं।

प्रयास कीजिए

प्रश्न 1.
ज्ञात कीजिए-
(i) 235.4 ÷ 10
(ii) 235.4 ÷ 100
(iii) 235.4 ÷ 1000
हल:

पाठ्य-पुस्तक पृष्ठ संख्या # 54
प्रयास कीजिए

प्रश्न
(i) 35.7 ÷ 3 = ?
(ii) 25.5 ÷ 3= ?
हल:

प्रयास कीजिए

प्रश्न
(i) 43.15 ÷ 5 = ?
(ii) 82.44 ÷ 6 ?
हल:

पाठ्य-पुस्तक पृष्ठ संख्या # 55

प्रयास कीजिए
(i) 15.55 ÷ 5
(ii) 126.35 ÷ 7
हल:

पाठ्य-पुस्तक पृष्ठ संख्या # 56
प्रयास कीजिए

प्रश्न 1.
ज्ञात कीजिए-
MP Board Class 7th Maths Solutions Chapter 2 भिन्न एवं दशमलव Ex 2.6 5
हल:

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