Question

5. Complete the following activity to find the sum of natural numbers from 1 to 140
which are divisible by 4.

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Answer 1

Answer:

From 1 to 140, natural numbers divisible by 4 are 4, 8, ........136.

a=4

a=4

NOW

tn= a+(n-1)d

136 = 4+ (n-1)4

== 136 = 4 + 4 n-4

==4n = 136

==n = 34

Thus, number of term (n) = 34 we know that,

Sn = n/2 (2a + (n-1) d)

therefore S 34 = 34/2 (2(4)+(34-1)(4))

=17 (8+132)

=17(140)

=2380

Step-by-step explanation:

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Answer 2

Answer:

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