Page 39 - Revised Maths Wisdom Class - 2
P. 39
Subtraction of 2-Digit Numbers 37
Alternative Methodd
Alternative Metho
Subtraction by using Counters
1. Subtract 18 from 45.
Tens Ones + – = 0
= 10 = 1
+ + + + + + + + + 45
– – – – –
– 18
– – –
+ + + + +
+ + + + + + + + + 45 4 5
+ + + + +
– 1 8
– – – – –
– 18
– – – 2 7
+ + + + +
– – – – –
+ + + 45 – 18
– + + + + +
– – –
+ + + + +
2 7 Result
Answer: Twenty seven
2. 26 – 3 = ? ⇐ + + + + + + + + + +
+ + + + + + + + + + = 23
+ + + + + + – – –
3. 2 – 3 = ? ⇐ + + = – 1
– – –
R Remember!emember!emember!
4. 5 – (–2) = ? ⇐ + + – R
+ + – Here, first number tells
+ = 7 us what to start with.
+ Second number tells us
+ what to take away.
