Answer: A) Use rounding to get -6(0.2), and then multiply. B) Use compatible numbers, such as -6(0.5), and then multiply. D) Use front-end estimation to get -6(0.2), and then multiply
A (Use rounding to get -6(0.2), and then multiply.) B (Use compatible numbers, such as -6(0.5), and then multiply.) D (Use front-end estimation to get -6(0.2), and then multiply.)