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MENTAL MATHS-6
A. Fill in the blanks:
(a) 3668 – 000 0 = ______ (b) 4775 – 4775 = ______
(c) 4580 – 000 0 = ______ (d) 2512 – 2512 = ______
B. Solve the following sums:
(a) 4206 – 3687 + 3508
Th H T O Th H T O
+ –
(b) 6375 – 3849 + 1225
Th H T O Th H T O
+ –
Word PROBLEM
PROBLEM INVOLVING ADDITION AND SUBTRACTION
Example: A bag contains 4890 red, black and green marbles. If the number
of red marbles is 1785, black marbles 1825. Find the number of
green marbles.
Th H T O
Solution: (i) First, we do the addition.
Number of red marbles = 1 7 8 5
Number of black marbles = + 1 8 2 5
Number of red and black marbles = 3 6 1 0
56
Subtraction
Mathematics-3
