Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers

Perfect Numbers

Author:Jayashri Bhattacharya & Tarika Dhawan

6th CBSE

IMPORTANT

Perfect Numbers: Overview

This topic talks about perfect numbers and teaches us ways to find the perfect numbers. It mentions that if the sum of all the factors of the given number is twice the given number, it is said to be a perfect number.

Important Questions on Perfect Numbers

EASY

IMPORTANT

Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 1

Find:

Two perfect numbers less than $50$ .

MEDIUM

IMPORTANT

Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 2

$1 + 2 + 3 + . . . + 10 = 55$

$11 + 12 + 13 + . . . + 20 = 155$

$21 + 22 + 23 + . . . + 30 = 255$

Following the pattern, the value of :

$891 + 892 + 893 + . . . + 900 = ?$

EASY

IMPORTANT

Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 3

Identify the pattern given below:
$1 + 2 + 3 + . . . + 10 = 55$
$11 + 12 + 13 + . . . + 20 = 155$
$21 + 22 + 23 + . . . + 30 = 255$
Now, find the value of the following:
$121 + 122 + 123 + . . . + 130 = ?$

EASY

IMPORTANT

Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 4

Identify the pattern given below:
$1 + 2 + 3 + . . . + 10 = 55$
$11 + 12 + 13 + . . . + 20 = 155$
$21 + 22 + 23 + . . . + 30 = 255$
Now, find the value of the following:
$51 + 52 + 53 + . . . + 60 = ?$

EASY

IMPORTANT

Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 5

Evaluate: $100 \times 499 - 99 \times 100$

EASY

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Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 6

Evaluate: $88 \times 76 + 12 \times 76$

MEDIUM

IMPORTANT

Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 7

Write $494$ in Roman numerals. $(DCXCIV / CDXCIV / DCXIV)$

EASY

IMPORTANT

Universal Mathematics 6>Learning About Numbers>Playing with Numbers>Perfect Numbers> Q 8

Write $657$ in Roman numerals.