Find the value of −157÷−521
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
15×21+(−5)×(−7)= ___
Find the value 37+(-21)-26+15-(-2)+(-9).
Simplify the following
1)11-[7-{5-3(9-(3-6))}]
2)16-[5-2+{7of2-(6÷3×2-1+3)}]