Page 34 - Math 4
P. 34
Fundamental Operations Fundamental Operations
3.2 Relation between addition and subtraction
Let's investigate, how addition and subtraction work together.
Classwork - Exercise
1. Let's tell and write the answer as quickly as possible.
a) 4 + 3 = Then 7 – 4 = and 7 – 3 =
b) 4 + 5 = Then 9 – 4 = and 9 – 5 =
c) 2 + 8 = Then 10 – 2 = and 10 – 8 =
d) 7 + 6 = Then – 7 = 6 and 13 – = 7
e) 8 + 7 = Then 15 – = 7 and – 7 = 8
2. Let's listen to your teacher and perform the following operations.
a) + = Then – = and – =
b) + = Then – = and – =
c) + = Then – = and – =
3. It's your time! Let's write your numbers in the blanks. Then, complete
the sums.
a) + = Then – = and – =
b) + = Then – = and – =
c) + = Then – = and – =
Puzzle Time!
4. Let's fill in the missing numbers to complete the sums.
8 + 12 = 20 24 + = – 9 = 21
+ + + + + + – – –
10 + 5 = 15 + 4 = – = 5
= = = = = = = = =
+ 17 = 35 40 + = 54 22 – =
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