Multiplication of Units of Mass
We can multiply the units of mass kg and g by a number like
ordinary numbers.
1. Multiply 115 kg by 6.
Hence, 115 kg × 6 = 690 kg
2. Multiply 32 kg 126 g by 7.
Multiply the grams by 7.
126 × 7 = 882 g. Write 882 under g column.
Multiply the kilograms
32 × 7 = 224 kg
Write 224 under kg column.
Hence, 32 kg 126 g × 7 = 224 kg 882 g.
When measurements are given as combination of two units, we can also first convert the bigger units to lower units and then multiply.
Alternative method:
First convert 32 kg 162 g into gram and then multiply by 7.
32 kg 126 g = 32000 g + 126 g
= 32126 g
32126 × 7 = 224882 g
Convert 224882 g into kg
224882 g = 224000 + 882 g
= 224 kg + 882 g
= 224 kg 882 g
Hence 32 kg 126 g × 7 = 224 kg 882 g
3. Multiply 19 kg 763 g by 5.
Solution:
First convert 19 kg 763 g into gram and then multiply by 5.
19 kg 763 g = 19000 g + 763 g
= 19763 g
19763 × 5 = 98815 g
Convert 98815 g into kg
98815 g = 98000 + 815 g
= 98 kg + 815 g
= 98 kg 815 g
Hence, 19 kg 763 g × 5 = 98 kg 815 g
Questions and Answers on Multiplication of Units of Mass:
1. The weight of one piece of each object is given. Find the weight of more.
(i) 5 bottles: __________
(ii) 20 pairs of shoes: __________
(iii) 10 books: __________
(iv) 45 bats: __________
(v) 17 chairs: __________
(vi) 16 pairs of skating boots: __________
Answers:
1. (i) 9 kg
(ii) 30 kg
(iii) 31 kg 500 g
(iv) 40 kg 500 g
(v) 72 kg 250 g
(vi) 42 kg 80 g
2. Multiply the given:
(i) 7 kg 34 g by 10
(ii) 42 g 30 mg by 5
(iii) 48 kg 16 g by 6
(iv) 80 kg 450 g by 3
(v) 33 g 72 mg by 11
(vi) 9 kg 355 g by 6
Answers:
2. (i) 70 kg 340 g
(ii) 210 g 150 mg
(iii) 288 kg 96 g
(iv) 241 kg 350 g
(v) 363 g 792 mg
(vi) 56 kg 130 g
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