The numbers 6 and 8 are called rectangular nu
rectangular numbers?
Exercise 2.3
1. Using shorter method, find
(i) 3246 + 9999
(ii) 7501 + 99999
(iv) 25718 - 9999 (v) 123 x 999
2. Without using a diagram, find
(i) 9th square number
(iii) 5377 - 999
(oi) 203 x 9999
(ii) 7th number tringular
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