Page 36 - Math 4
P. 36
Fundamental Operations Fundamental Operations
11. a) 5 tens + 7 tens = tens = hundred and tens
b) 8 tens + 6 tens = =
c) 9 tens + 8 tens = =
12. a) 8 hundreds + 4 hundreds = h = thousands and hundreds
b) 7 hundreds + 6 hundreds = =
c) 5 hundreds + 9 hundreds = =
Exercise - 3.1
Section A - Classwork
1. Let's tell and write the missing numbers as quickly as possible.
a) 8 + = 15 b) + 6 = 18 c) 14 + = 21
d) + 40 = 60 e) 30 + = 80 f) + 45 = 90
g) 16 – = 7 h) – 5 = 13 i) 28 – = 8
j) – 10 = 40 k) 70 – = 30 l) – 40 = 50
2. Each hexagon is made by adding up the numbers in the two hexagons
below it. Let's tell and write the missing numbers.
a) b)
27
17 10 13
6 11 7 9 8
3. The sum of the numbers in each row, column, and diagonal is the same.
Let's complete these magic squares.
a) b) c)
9 9 11
6 10 8
3 10 5 5 7
Sum is 18 Sum is 24 Sum is 30
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v edanta Ex c e l in Mathematics - Book 4 34 Approved by Curriculum Development Centre, Sanothimi, Bhaktapur
vedanta Excel in Mathematics - Book 4
