Page 49 - Math Skill - 4

Multiplication and Division 47

MIND MAP

Multiplication and Division

Multiplication Division Division
“Multiplication is the “Estimation means ‘Approximation’”. “Division is the process
repeated addition”. of repeated subtraction”.
i.e. 4 × 3 = 12 = 3 + 3 + 3 + 3 PROCESS i.e. 12 ÷ 3 = 4
1. If the digit on the right of the rounding or 12 – 3 – 3 – 3 – 3 = 0
place is greater then or equal to 5 then
add 1 to the digit at rounding place 4 times subtraction
otherwise donot change.
Process
a × b = c 2. Replace all digits to the right of the Process
rounding place by zeros.
Multiplicand Product APPLICATIONS Divisor Dividend Quotient
Multiplier
7486 Round off tens 7490
Remainder
8645 Round off hundred 8600

Properties

� We can multiply the given numbers in Verification
any order Dividend = Quotient × Divisor + Remainder
i.e. 37 × 29 = 29 × 37 = 1073

� Product of a number and 1 is number
itself Properties
i.e. 65 × 1 = 65 � Number ÷ 1 = Number

� Product of a number and 0 is always 0
� Number ÷ Number = 1
i.e. 70 × 0 = 0 � Number ÷ 0 = Meaning less
� Multiply a given number by 10/100/1000 � 0 ÷ Number = 0
then add corresponding zeros to the
right of given number. � Dividing a number by 10/100/1000 then quotient is
obtained by removing the digits corresponding to number
i.e. 75 × 10 = 7 5 0 of zeros in the divisor from dividend.
75
871 × 100 = 8 7 1 0 0 i.e. Quotient = 7 Remainder = 5
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