P5/P6 Math: Sum of Consecutive, Odd or Even Numbers in a Series

Summing up 2 or 3 numbers are taught in since kindergarten and primary 1.

However, in a series of numbers, a method must be used to find the sum of 20 - 50 numbers without manually adding 2 in a working and continuously adding the next one until the end of the series.

This method was taught in some schools though many choose to omit it due to lack of time within the curriculum (aka rainbow method).

A rainbow can be seen from one end to the other in Singapore City

The question below will randomize with different numbers every hour. 

Copy below question down before making attempt.

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P5/P6 Math: Consecutive Numbers in a Series

 These type of questions requires students to be able to understand the meaning of "consecutive".

The Cambridge Dictionary described this word as 

Consecutive events, numbers, etc. follow one after another without an interruption:

Such questions will usually appear in Paper 1 of P5 and P6 exams.
Calculator is not allowed.

The sum of 5 consecutive odd numbers is 45.

What is the 2nd number in the series?

Bar Graph showing consecutive increase

If the above question is easy, try to do the more challenging question below.

The question below will randomize with different numbers every hour. 

Copy below question down before making attempt.

Below are 3 different questions to try.

Each of the consecutive series are different.

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