Evaluate - i-14-5-6-7- ii-7-6-18-91- iii-125-72-9-5- iv-11-9-51-44- v-16-5-20-8

(i) 14/5× 6/7 =( 14)×( 6)/5×7=( 2)×( 6)/5×1 = 12/7=22/5 (ii) 7/6× 18/91 =7×( 18)/6×91=1×( 3)/1×13= 3/13 (iii) 125/72×9/ 5 =( 125)×9/72× 5=25×1/8×1 =25/ ...

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VII

Mathematics

Multiplication and Division of Rational Numbers

Evaluate : i ...

Question

Evaluate :
$(i) \frac{- 14}{5} \times \frac{- 6}{7} (i i) \frac{7}{6} \times \frac{- 18}{91} (i i i) \frac{- 125}{72} \times \frac{9}{- 5} (i v) \frac{- 11}{9} \times \frac{- 51}{- 44} (v) - \frac{16}{5} \times \frac{- 20}{8}$

Open in App

Solution

$(i) \frac{- 14}{5} \times \frac{- 6}{7} = \frac{(- 14) \times (- 6)}{5 \times 7} = \frac{(- 2) \times (- 6)}{5 \times 1} = \frac{12}{7} = 2 \frac{2}{5} (i i) \frac{7}{6} \times \frac{- 18}{91} = \frac{7 \times (- 18)}{6 \times 91} = \frac{1 \times (- 3)}{1 \times 13} = \frac{- 3}{13} (i i i) \frac{- 125}{72} \times \frac{9}{- 5} = \frac{(- 125) \times 9}{72 \times - 5} = \frac{25 \times 1}{8 \times 1} = \frac{25}{8} = 3 \frac{1}{3} (i v) \frac{- 11}{9} \times \frac{- 51}{- 44} = \frac{(- 11) \times (- 51)}{9 \times (- 44)} = \frac{1 \times (- 51)}{9 \times 4} = \frac{- 51}{36} = \frac{17}{12} (v) - \frac{16}{5} \times \frac{- 20}{8} = \frac{(- 16) \times 20}{5 \times 8} = \frac{(- 2) \times 4}{1 \times 1} = - 8$

Suggest Corrections

Similar questions

Q. Simplify:

(i)(−8) × 9 + (−8) × 7
(ii) 9 × (−13) + 9 × (−7)
(iii) 20 × (−16) + 20 × 14
(iv) (−16) × (−15) + (−16) × (−5)
(v) (−11) × (−15) + (−11) × (−25)
(vi) 10 × (−12) + 5 × (−12)
(vii) (−16) × (−8) + (−4) × (−8)
(viii) (−26) × 72 + (−26) × 28

Verify each of the following :

(i) $\frac{3}{7} \times \frac{- 5}{9} = \frac{- 5}{9} \times \frac{3}{7}$

(ii) $\frac{- 8}{7} \times \frac{13}{9} = \frac{13}{9} \times \frac{- 8}{7}$

(iii) $\frac{- 12}{5} \times \frac{7}{- 36} = \frac{7}{- 36} \times \frac{- 12}{5}$

(iv) $- 8 \times \frac{- 13}{12} = \frac{- 13}{12} \times (- 8)$

Q. Evaluate.
(i) 9 × (− 3) × (− 6)
(ii) (− 5) × (− 10) × (− 7) × 2
(iii) (− 18) × (− 43) × 0
(iv) (− 9) × (− 8) × (− 1) × 1
(v) − 12 × (− 15) × 6 × 4
(vi) − 7 × (− 4) × (− 6) × (− 2)

Evaluate: [(90 + 4) $\div$ 2 – 6 $\times$ 6 $\div$ 2+ {(7 + 4) $\times$ 10} + 8 $\times$ 9 – 5] $\times$ 10 + 8

Q. In a shop, different sizes of shoes sold in a week are 7, 9, 8, 6, 7, 10, 6, 7, 8, 9, 11, 5, 6, 7, 8, 5, 9, 10, 9, 11, 12, 8, 3, 3, 5, 4, 6, 7, 4, 6, 7, 8, 8, 6, 9. What is the difference of the number between shoes sold of size 6 and size 7?

Join BYJU'S Learning Program

Evaluate : (i) −145×−67(ii) 76×−1891(iii) −12572×9−5(iv) −119×−51−44(v) −165×−208

Evaluate :
$(i) \frac{- 14}{5} \times \frac{- 6}{7} (i i) \frac{7}{6} \times \frac{- 18}{91} (i i i) \frac{- 125}{72} \times \frac{9}{- 5} (i v) \frac{- 11}{9} \times \frac{- 51}{- 44} (v) - \frac{16}{5} \times \frac{- 20}{8}$