Question

Jaime knows that 30² is 900. He wonders if knowing that 30² can help him finds 29x31. Raquel knows what 25² equals. How can she use the knowledge to find 24x26?

Answer 1

Explanation:

notice that 29 is one smaller than 30 and is being multiplied by 31. it is one smaller times 31 so 900 - 31 = 869. 31 is one bigger multiplied by 29 so 869 + 29 = 898. plus 1 = 899

25 times 25 = 625

625 - 26 = 599

599 + 24 = 623

plus 1 = 624