Page 42 - Maths Skill - 3

40 Maths

SKILL BASED QUESTIONS

I. HOT Questions
Add across and down. After that add the sums. What do you search? One has been

completed for you. Complete the remaining.

Across
(i) 44 38 82 (ii) 25 35 (iii) 110 190

61
Down 105 53 114 60 75 290 510
196
91

II. Brain Teaser
1
1. Do you know why we call it a magic triangle? This is
because the sum of the numbers written inside the circles 1 + 5 + 3 = 9 5 6 2 + 6 + 1 = 9

on each side of the magic triangle is the same. Here the
sum is called the magic number.
3 4 2
4
3 + 4 + 2 = 9

2. Create a magic triangle using numbers 4 to 9 only
once. The sum of each side of the magic triangle

6 should be 18.

III. Puzzles with Magic Sums

Observe the given square.

Here is one big square which is divided into 9 (3 × 3) sub-squares which contain all
numbers 1–9 inside it. The numbers in each row add-up to the number in the box on
the right side of the square. Besides this, the number in each column add-up to the
number in the box below side of square. Now complete the following given below.

3 5 8 16 2 8 15 6 10

7 9 6 22 3 10 19

1 2 4 7 4 20 9 16
11 16 18 17 7 21 10 12 23

Word Stock
Sum Addend Estimate Remain Order Result Carry Arrange