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

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Solution

Using $B O D M A S$

$15 \times 21 + (- 5) \times (- 7) = 315 + (- 5 \times - 7)$

$= 315 + 35$

$= 350$

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Similar questions

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

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

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

11, 18, 22, 19, 10, 15, 21, 7, 5

Solve:

(a) (b)

(e) (f)

(g) (h)

(i)

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