Estimating Sums and Differences in Math

What is an estimate?

• A number close to an exact solution

• A mathematical formula

• An exact solution to a problem

• A random guess

What is the sum in mathematical terms?

• The result of a division problem

• The result of an addition problem

• The result of a multiplication problem

• The result of a subtraction problem

What are compatible numbers?

• Numbers that are always even

• Numbers that are always odd

• Numbers that are prime

• Numbers that are easy to work with mentally

How would you estimate the sum of 52 and 74 using compatible numbers?

• 50 and 70

• 55 and 75

• 50 and 75

• 52 and 74

What is front-end estimation?

• A method of rounding to the nearest ten

• A method of using only even numbers for estimation

• A method of using the front digits for estimation

• A method of using the back digits for estimation

In front-end estimation, what do you do with the digits after the front digit?

• Ignore them

• Subtract them from the front digit

• Add them to the front digit

• Turn them into zeros

What is the rule for rounding estimation when not otherwise specified?

• Round to the nearest thousand

• Round to the nearest ten

• Round to the greatest place value of the smallest number

• Round to the nearest hundred

If you have the numbers 2960 and 4501, to which place value should you round them for estimation?

• Units place

• Hundreds place

• Thousands place

• Tens place

Why is estimation useful when solving problems?

• To avoid using a calculator

• To get an exact answer

• To check the reasonableness of an answer

• To make the problem more complex

In the practical problem involving travel distances, what method was used for estimation?

• Compatible numbers

• Front-end estimation

• Rounding estimation

• Exact calculation