Subtraction Placing the Numbers in Column - Grade 2 Math
Subtraction Placing the Numbers in Column
We know that a number has digits in ones, tens, hundred or bigger places. When we subtract one number from another, we do so by subtracting the digits in the same place values. Let us learn this method of subtraction by placing the numbers, with an example.
1. Subtract
12 from 78 (by placing the numbers in column.)
Solution:
|
TO
|
|
78
-12 |
|
66
|
Description:
(i)
One’s place, 8 – 2 = 6 ones.
(ii) Ten’s
place, 7 – 1 = 6 tens.
(iii) 6
tens + 6 ones = 60 + 6 = 66.
(iv) So, 78 – 12 = 66.
2. Subtract 55 from 89 (by placing the numbers
in column.)
Solution:
|
TO
|
|
89
-55 |
|
34
|
Description:
(i)
One’s place, 9 – 5 = 4 ones.
(ii)
Ten’s place, 8 – 5 = 3 tens.
(iii) 3
tens + 4 ones = 30 + 4 = 34.
(iv) So,
89 – 55 = 34.
3.
Subtract 34 from 85 (by placing the numbers in column.)
Solution:
|
TO
|
|
85
-34 |
|
51
|
Description:
(i)
One’s place, 5 – 4 = 1 ones.
(ii) Ten’s
place, 8 – 3 = 5 tens.
(iii) 5
tens + 1 ones = 50 + 1 = 51.
(iv) So,
85 – 34 = 51.
4.
Subtract 45 from 74 (by placing the numbers in column.)
Solution:
|
TO
|
|
74
-45 |
|
29
|
Description:
(i) Here,
4 < 5; so, one’s place, 14 – 5 = 9 ones.
(ii) Then,
ten’s place, 7 – 4 - 1 = 2 tens.
(iii) 2
tens + 9 ones = 20 + 9 = 29.
(iv) So,
74 – 45 = 29.
Ones: 0
− 5 → borrow 1 ten
So, 10 −
5 = 5
Tens: (7
becomes 6) → 6 − 4 = 2
5.
Subtract 56 from 84 (by placing the numbers in column.)
Solution:
|
TO
|
|
84
-56 |
|
28
|
Description:
(i) Here,
4 < 6; so, one’s place, 14 – 6 = 8 ones.
(ii)
Then, ten’s place, 8 – 5 - 1 = 2 tens.
(iii) 2
tens + 8 ones = 20 + 8 = 28.
(iv) So,
84 – 56 = 28.
6. Solve
the following subtraction placing the numbers in column.
(a) 56 −
23
(b) 78 −
41
(c) 64 −
32
(d) 95 −
54
(e) 83 −
27
(f) 70 −
45
Solution:
(a) 56 −
23
- 23
-----
33
Ones: 6
− 3 = 3
Tens: 5
− 2 = 3
(iii) 3
tens + 3 ones = 30 + 3 = 33.
(b) 78 −
41
- 41
-----
37
(i) Ones:
8 − 1 = 7
(ii) Tens:
7 − 4 = 3
(iii) 3
tens + 7 ones = 30 + 7 = 37.
(c) 64 −
32
- 32
-----
32
(i) Ones:
4 − 2 = 2
(ii) Tens:
6 − 3 = 3
(iii) 3
tens + 2 ones = 30 + 2 = 32.
(d) 95 −
54
- 54
-----
41
(i) Ones:
5 − 4 = 1
(ii) Tens:
9 − 5 = 4
(iii) 4
tens + 1 ones = 40 + 1 = 41.
(e) 83 −
27
- 27
-----
56
(i) Ones:
3 − 7 → borrow 1 ten
So, 13 −
7 = 6
(ii) Tens:
(8 becomes 7) → 7 − 2 = 5
(iii) 5
tens + 6 ones = 50 + 6 = 56.
(f) 70 −
45
- 45
-----
25
(i) Ones:
0 − 5 → borrow 1 ten
So, 10 −
5 = 5
(ii) Tens:
(7 becomes 6) → 6 − 4 = 2
(iii) 2
tens + 5 ones = 20 + 5 = 25.
7. Do
yourself:
(a)
73-25
(b)
74-26
(c)
75-25
(d)
76-27
(e)
77-28
(f)
78-28
(g)
79-30
(h)
80-31
(i)
81-32
(j)
82-33
(k)
83-34
(l)
84-33
(m)
85-34
(n)
86-31
(o)
87-24
(p)
88-26
(q)
89-25
(r)
90-65
(r)
91-90
(s)
81-32
(t)
33-11
(u)
55-35
(v)
33-12
(w)
92-23
(x)
22-21
(y)
65-61
(z) 33-5
Answer:
(a) 48
(b) 48
(c) 50
(d) 49
(e) 49
(f) 50
(g) 49
(h) 49
(i) 49
(j) 49
(k) 49
(l) 51
(m) 51
(n) 55
(o) 63
(p) 62
(q) 64
(r) 25
(r) 1
(s) 49
(t) 22
(u) 20
(v) 21
(w) 69
(x) 1
(y) 4
(z) 28
Also: