What is 18 * 5?
What is 18 * 5?
Approach: Multiply by 10 and divide by 2.
90. 180 / 2 = 90.
Follow-up: What is 18 * 50?
Key concepts: halving and doubling.
What is 18 * 5?
Approach: Multiply by 10 and divide by 2.
90. 180 / 2 = 90.
Follow-up: What is 18 * 50?
Key concepts: halving and doubling.