Relation between addition and subtraction (Chapter 4)
Activities
There were some mangoes in a bag. Then 5 more mangoes were put in the bag, now there are 12 mangoes altogether. How many mangoes were in the bag at the first?
In a mathematical sentence:
7
+ 5 = 12
The number of mangoes we had at first
7
5 more
12 mangoes
Fill in the blank boxes
(1)
14+
23
=37
(2)
29-
17
=12
(3)
25+
38
=63
(4)
51-
33
=18
(5)
33
+15
=48
(6)
56
-13
=43
(7)
47
+28
=75
(8)
93
-36
=57
Fill in the blank boxes
8 +
7
= 15
8
?
15
37 -
7
= 30
37
?
30
9
+ 23
= 32
?
23
32
66
- 19
= 47
?
19
47