Vocabulary
The solution to an addition problem.
What is a sum?
Tonya collected 320 friendship bracelets. Her sister collected 290. Find the difference between the number or friendship bracelets.
What is 30?
Find the sum between 452 and 500.
What is 952?
Round 137 to the nearest 10.
What is 140?
What straight tool that uses tick marks can we use to help us determine where our benchmark numbers are?
What is a number line?
The solution to a subtraction problem.
What is a difference?
Find the difference between 156 and 82.
What is 74?
Find the sum between 320 and 600.
What is 920?
Round 903 to the nearest ten.
What is 900?
What strategy can we use when we grab a number and count up or down to the next number?
What is counting on?
Making a reasonable, round solution to an addition or subtraction problem.
What is Estimate?
Find the difference between 800 and 785.
What is 15?
Al spent $27 on a shirt and $120 on books. Find the sum of the money Al spent.
What is $147?
Estimate the sum of 115 and 301. Round to the nearest 10!
What is 420?
What computer device can we use to calculate numbers when we are checking our work?
What is a calculator?
In second grade we are ______________ to the nearest 10.
What is Rounding?
Joe and Susan went for a run. Joe ran 24 laps and Susan ran 15 laps. Find the difference between the laps they ran.
What is 9?
Harry is 12 years old. His sister is 9 years younger. Find the sum of their ages.
What is 15?
Mr. D wants to purchase a new set of swings and a sliding board for the playground. He only has $600 to spend. If a sliding board costs $212 and a set of swings costs $399, ESTIMATE if Mr. D has enough money. Round to the NEAREST 10!
No, because the total cost would be about $610.
What is a bar model?
The act of adding or subtracting using strategies that are in your BRAIN ONLY!
What is Mental Math?
Elizabeth has a blue ribbon and a red ribbon. The blue ribbon is 27 centimeters long. The red ribbon is 18 centimeters long. What is the difference between their lengths?
What is 9 centimeters?
Greg has collected 32 green frogs. His mother gives him 15 red frogs. Find the sum of frogs that Greg has now.
What is 47?
You can use an estimate to check that a sum or a difference is ____________________.
What is reasonable?
The circular bonds we use to help us deconstruct (or take a part) a number.
What are number bonds?