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Mental Arithmetic

The document provides a comprehensive overview of basic arithmetic operations including addition, subtraction, multiplication, and division, with examples for each operation. It also covers concepts such as doubling, rounding, and properties of 2D and 3D shapes, along with practical applications in money and measurement. Additionally, it includes time-related questions and word problems to apply these mathematical concepts in real-life scenarios.

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216 views4 pages

Mental Arithmetic

The document provides a comprehensive overview of basic arithmetic operations including addition, subtraction, multiplication, and division, with examples for each operation. It also covers concepts such as doubling, rounding, and properties of 2D and 3D shapes, along with practical applications in money and measurement. Additionally, it includes time-related questions and word problems to apply these mathematical concepts in real-life scenarios.

Uploaded by

compnetworxxx
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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mental arithmetic - addition, subtraction, multiplication and

division;
Addition of 2 digit numbers -
25+7 =
7 is broken into two numerals that is 5+2
so we have 25+5 =30+2
=32
Addition of 3 digit numbers according to the place value of the
numbers
171+512+405=
=100+500+400 = 1000
=70+10+0 = 80
=1+2+5 = 8
Total Sum=1088
273+315 =
621+23+132=
505+410+70=
Subtraction
Subtracting Zero
When you subtract zero from any number, then the answer would
be same number.
78-0=78
57-0=57
88-0=88

Multiplication is repeated………………………
The answer of the multiplication is called the ………………….
Any number multiplied by 0, the product is always………………
…………. x 365 = 0
The product of any number and 1 is number……………………
65 x 1 x 1 x 1 = …………
To multiply by multiples of 10, 100, 1000 put as many
…………………….. at the end of the product as there are in the
multiplier
Find the product:
87 x 10 = …………………..
52 x 100 = …………………..
348 x 10 = …………………..
675 x 10 = ………………….
30 x 100 = ………………….
8 x 1000 = ………………….
560 x 10 = …………..
28 x ……….. = 280
16 x ……….. = 1600
……….. x 25 = 250
………. x 68 = 6800
………… x 15 = 1500
………… x 8600 = 0

To multiply a number by 9 multiply it by 10 first and then


subtract the number itself from the result

325*9=
325 *10 =3250
3250-325=2925

Doubling :what is double 40?


Add the number itself
40+40=80
balancing equation questions;
Round off 68 to the nearest 100

geometry questions usually based around 2d and 3d shape


properties;
money questions;
measures questions: length, weight, liquid volume
1dozen = ____________pcs
2 dozen apples = ………….. apples.
1 pair = 2
12 pairs = ………… dozen.
8 times 7 is ………….
……….. x 9 = 63.
6 x 3 = 18, 3 x 6 = …………….
time questions -
1. 60 ___________________= 1 hour
2. _______________seconds = 1minute
3. 1 minute = ___________60seconds
4. 12 months = _________ year
5. 60 ___________________= 1 minutes
6. 7 ________________= 1 week
7. 60seconds =1 __________
8. 7days= __________ week
9. 12________ =1 year
10.365 _______= 1 year
11._____weeks = 1 year
Solve the following word problems:
Meera eats 3 chapattis every day. In 1 week, how many
chapattis has she eaten?
The cost of 1 kg of milk is Rs. 36. What will be the cost of 87
kg of Milk?
One day has 24 hours. How many hours are there in 15 days?

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