Key takeaway
The four operations, cleanly
Before you read
Test yourself first: 5 questions
Question 1 of 5
A number increased by 15 equals 40. What is the number?
Answer: B. Let the number be n: n + 15 = 40, so n = 40 − 15 = 25.
Question 2 of 5
A number is 30% of 200. What is the number?
Answer: B. 30% × 200 = 0.30 × 200 = 60.
Question 3 of 5
Using order of operations, evaluate 6 + 2 × 3.
Answer: B. Multiply before adding: 2 × 3 = 6, then 6 + 6 = 12.
Question 4 of 5
Using order of operations, evaluate 15 + 3 × 4.
Answer: B. Multiply first: 3 × 4 = 12, then 15 + 12 = 27.
Question 5 of 5
What is the least common multiple (LCM) of 4 and 6?
Answer: B. The smallest number both 4 and 6 divide into is 12.
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