Rounding
118 rounded to the nearest ten.
What is 120?
Estimate the sum of 528 + 618.
What is 1,150?
This month the 3rd and 4th graders at Marin Horizon School had a contest to see who could read the most books. By the end of the month, the 3rd graders read 637 books and the 4th graders read 674. About how many books did they read in total?
What is 1,310 books?
The name of the strategy where you carry the one.
What is traditional algorithm?
234 rounded to the nearest hundred.
What is 200?
Estimate the problem 201 - 163.
What is 40?
This month the 3rd and 4th graders at Marin Horizon School had a contest to see who could read the most books. By the end of the month, the 3rd graders read 637 books and the 4th graders read 674. Exactly how many books did they read in total?
What is 1,311 books?
Use two different strategies to find the sum of 512 + 365.
What is 877?
998 rounded to the nearest ten.
What is 1,000?
Estimate the problem 173 - 125.
What is 40?
This month the 3rd and 4th graders at Marin Horizon School had a contest to see who could read the most books. By the end of the month, the 3rd graders read 637 books and the 4th graders read 674. About how many more books did the 4th graders read than the 3rd graders?
What is 30 more books?
The name of the strategy where you add one number to one side of the equation and subtract the same number from the other side.
What is the give and take strategy?
3,890 rounded to the nearest hundred.
What is 3,900?
618, 324, 274, 590, 692
Use estimation to choose two of these numbers whose combined total is close to 1200.
What is 618 and 590?
There were 482 books in the 3rd grade class library. Last week, 73 books were checked out, and 49 books were returned. About how many books are in the class library now?
What is 460 books?
The name of the strategy where you subtract the same number from both sides in a subtraction equation.
What is constant difference strategy?
5,685 rounded to the nearest ten.
What is 5,690?
Estimate the problem 593 - 214 - 41.
What is 340?
Sarah has $50 to buy school supplies. Notebooks cost $3.95 each, and pens cost $1.85 per pack. If she buys 7 notebooks and 5 packs of pens, about how much money will she spend, and will she have enough money?
What is $38? (she has enough money)
List 5 strategies for addition and subtraction that we have learned in class so far.
What is traditional algorithm, give and take, number line, constant difference, and place value splitting