What is 15 squared?
What is 15 squared?
Approach: Memory or (10 * 20) + 25.
225. 1 * 2 = 2, append 25.
Follow-up: What is 25 squared?
Key concepts: squares of numbers ending in 5.
What is 15 squared?
Approach: Memory or (10 * 20) + 25.
225. 1 * 2 = 2, append 25.
Follow-up: What is 25 squared?
Key concepts: squares of numbers ending in 5.