Page 77 - Touchpad Mathematics_Ver1.0_C4

2. Write >, < or = in the blanks.

a. 4 × 7 4 × 9 b. 10 × 5 10 × 3 c. 3 × 9 9 × 3

d. 2 × 7 2 × 5 e. 8 × 9 9 × 3 f. 4 × 10 5 × 10
3. observe and complete the pattern.

a. 3, 6, 9, ____, ____, ____ b. 4, 8, 12, ____, ____, ____
c. 15, 20, 25, ____, ____, ____ d. 6, 12, 18, ____, ____, ____

e. 35, 42, 49, ____, ____, ____ f. 8, 16, 24, ____, ____, ____
g. 18, 27, 36, ____, ____, ____ h. 40, 50, 60, ____, ____, ____

21 st
MulTipliCATioN uSiNg fiNgerS Century #Art Integration
Skills

Let us start the multiplication using our hands. 3 8
2 4 7 9
Case 1. Multiplying a single digit number by 9 5 6

• Mark your fingers with numbers 1 to 10 as shown in the 1 10
image given alongside.

• Bend the finger of your hand with the number that you
are going to multiply by 9. Suppose we have to multiply 2 4 7 8 9
3 by 9; we will then bend the finger with 3 marked on it 3 5 6
as shown in the image alongside. 1 10

• Count the number of fingers on either side of the bent
finger. The number of fingers on the left side will tell you
the digit in the tens place and the number of fingers on 3 x 9
the right side of the bent finger will tell you the digit in the ones place. Here we can
see the number of fingers in the left side is 2 and that of the right side is 7.

Hence, 3 × 9 = 27.

Case 2. Multiplying two numbers from 6 to 10 9 8 7 7 8 9

Multiplication using fingers just requires the knowledge of 6 6

tables up to 4 × 4 and multiplication of any number by 10. 10 10
• Mark the fingers with numbers 6 to 10 as shown here.

• Touch the corresponding fingers of both hands
• Count the number of fingers up to the touched fingers starting from the little one.

This will tell you the digit to be put in the tens place.
• Multiply the fingers of both hands above the touched fingers to obtain the digit in
the ones place.

75
Multiplication