Page 58 - Revised Maths Wisdom Class - 1
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56 MATHS
Subtraction by Counters
+ _ = 0
Here, the combination of one positive symbol and one negative symbol represents
zero.
1. 3 –2 = ?
Here, 3 is positive number Now,
So, 3 = + 3 – 2 = 3 – 2
+ + _ = 0
+
+ _ = 0
and 2 is negative number
So, 2 = _ + Rest value
_ So, answer is 1.
2. 8 – 5 = ? ⇐ + _ = 0
+ _ = 0
+ _ = 0
+ _ = 0
+ _ = 0 R
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+ First number tells us
+ Rest value what to start with.
Second number tells
+
us what to take away.
So, answer is 3.
Subtraction by Sticks
We can also subtract numbers using sticks.
To subtract 5 – 2, we do the following.
5 ||||| 1. Arrange the numbers in column.
– 2 2. Draw as many sticks as the bigger number.
3 3. Strike out as many sticks as the smaller number.
4. Count and write the number of sticks left as the difference.
