Study the following patterns.
1 =1², 1 + 3 = 2², 1 + 3 + 5 = 3², 1 + 3 + 5 + 7 = 4²
Hence, find the sum of
(a) First 19 odd numbers.
(b) First 21 odd numbers.

In a school, there are four sections of class VI. Each section has 50 students. Money collected for picnic from each student is Rs 125. Find the r total amount collected.

Write the following numbers as directed using dots.
(a) 16 as a square
(b) 26 as a rectangle.

Find 15 x 68, 17 x 23, 69 x 78 + 22 x 69 Using distributive property

Using properties of whole numbers, simplify the following:
(i) 5712 x 75 - 72 x 5712
(ii) 2103 x 68 - 32 x 2103.

Find the product of the smallest whole number with the largest three-digit whole number.

Mohan has Rs 10000 in his account. He spent Rs 5945 on his birthday. How much money left in his account?

Find the value of the following:
(i) 175 x 17 + 175 x 25
(ii) 207 x 80 + 207 x 20.

Study the following patterns.
                   1 = 12
             1 + 3 = 22
       1 + 3 + 5 = 32
 1 + 3 + 5 + 7 = 42
Hence, find the sum of
(a) first 12 odd numbers
(b) first 50 odd numbers.

Mr. Rajesh withdraws Rs 100000 from his bank account. He purchased a TV set for Rs 38650, a refrigerator for Rs 23880 and jewellery worth Rs 35560. How much money was left with him?