Page 102 - Math Genius C2

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To find the double, we add the number twice or multiply 2 by the number.
examples: Math Insight

(a) Double of 3 = 3 + 3 = 6 or 2 × 3 = 6 Any number multiplied by:

(b) Double of 4 = 4 + 4 = 8 or 2 × 4 = 8 l 0 is equal to 0.
l 1 is equal to the number itself.
(c) Double of 5 = 5 + 5 = 10 or 2 × 5 = 10 l 2 is equal to double the number.

activity
Experiential Learning
Make a 3 × 4 grid for playing ‘Bingo’.

Fill the boxes of the grid with any 12 numbers from the
given chart. × 1 2 3 4 5 6
Numbers can be repeated. 1 1 2 3 4 5 6
Let one child throw a pair of dice and say the 2 2 4 6 8 10 12
product of the number of dots appearing 3 3 6 9 12 15 18
on the dice. Other children will cross the 4 4 8 12 16 20 24
number on their grid. Continue this till a 5 5 10 15 20 25 30
child crosses all the numbers. 6 6 12 18 24 30 36
The child who crosses all the numbers will say aloud Bingo!

Practice Time 5C

1. fill in the boxes.

(a) 1 × 2 = (b) 1 × 5 = (c) 5 × 1 =

(d) 1 × 8 = (e) 9 × 0 = (f) 7 × 1 =

(g) 1 × 1 = (h) 0 × 3 = (i) 3 × 2 =

2. fill the missing numbers.

(a) 3 × 4 = 4 × (b) 5 × 6 = 6 × (c) 2 × 5 = 5 ×

(d) 4 × 5 = 5 × (e) 3 × 7 = × 3 (f) 2 × 6 = × 2

(g) 2 × 8 = × 2 (h) 7 × 4 = × 7 (i) × 5 = 5 × 8
3. find the double of the following. One has been done for you.

(a) Double of 7 = 2 × 7 = 14 (b) Double of 6 = 2 × 6 =

(c) Double of 8 = 2 × 8 = (d) Double of 9 = 2 × 9 =

(e) Double of 10 = 2 × 10 = (f) Double of 1 = 2 × 1 =

100 Mathematics-2