What is the best estimate for the product of 289 and 7?

Write a pair of integers whose sum gives

a) a negative integer

b) an integer smaller than both the integer

c) an integer smaller than only one of the integer

d) an integer greater than both the integer

The height of a place A is 1800 m above sea level. Another place B is 700 m below sea level. What is the difference between the levels of these two places?

Starting from the greatest 6 - digit number write the previous five numbers in descending order.

Write the expressions for each of the following using brackets. (a) Four multiplied by the sum of nine and two.

(b) Divide the difference between eighteen and six by four.

(c) Forty - five divided by three times the sum of three and two.