15 - 21 - -5- - -7- - -

Using BODMAS 15 × 21 + (−5) × ( 7)=315+( 5× 7) = 315 + 35 = 350 ...

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BODMAS

15 × 21 + (−5...

Question

$15 \times 21 + (- 5) \times (- 7) =$ ___

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Solution

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Answer in True or False

$\frac{7}{5}$ $=$ $\frac{21}{15}$

Without adding find the sum

(i) 1 + 3 + 5 + 7 + 9

(ii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

(iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

1 + 3 + 5 + 7 + 9

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

$15 \times 21 + (- 5) \times (- 7) =$ ___

(\frac{- 5}{7} + \frac{8}{21}) \times (\frac{7}{3} \div \frac{2}{15})

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