Without using a diagram, find: (i) 9th square number (ii) 7th triangular number

Question

KnowledgeBoat · Accepted Answer

(i) The nth square number is given by n × n = n2. So, the 9th square number = 9 × 9 = 92 = 81. (ii) The nth triangular number is given by . So, the 7th triangular number = = = = 28.

Mathematics

Without using a diagram, find:
(i) 9^th square number
(ii) 7^th triangular number

Whole Numbers

Related Questions

Using shorter method, find:
(i) 3246 + 9999
(ii) 7501 + 99999
(iii) 5377 - 999
(iv) 25718 - 9999
(v) 123 × 999
(vi) 203 × 9999

(i) Can a rectangular number be a square number?
(ii) Can a triangular number be a square number?

Observe the following pattern and fill in the blanks:
1 × 9 + 1 = 10
12 × 9 + 2 = 110
123 × 9 + 3 = 1110
1234 × 9 + 4 = …….
12345 × 9 + 5 = …….

Mathematics

Without using a diagram, find:(i) 9th square number(ii) 7th triangular number

Whole Numbers

Related Questions

Using shorter method, find:(i) 3246 + 9999(ii) 7501 + 99999(iii) 5377 - 999(iv) 25718 - 9999(v) 123 × 999(vi) 203 × 9999

(i) Can a rectangular number be a square number?(ii) Can a triangular number be a square number?

Observe the following pattern and fill in the blanks:1 × 9 + 1 = 1012 × 9 + 2 = 110123 × 9 + 3 = 11101234 × 9 + 4 = …….12345 × 9 + 5 = …….

Without using a diagram, find:
(i) 9^th square number
(ii) 7^th triangular number

Using shorter method, find:
(i) 3246 + 9999
(ii) 7501 + 99999
(iii) 5377 - 999
(iv) 25718 - 9999
(v) 123 × 999
(vi) 203 × 9999

(i) Can a rectangular number be a square number?
(ii) Can a triangular number be a square number?

Observe the following pattern and fill in the blanks:
1 × 9 + 1 = 10
12 × 9 + 2 = 110
123 × 9 + 3 = 1110
1234 × 9 + 4 = …….
12345 × 9 + 5 = …….