Mental Addition and subtraction
Problem Solving
Rounding Numbers
Vocabulary
Front End Estimation
100
Add mentally. Use the "add the tens, then add the extra ones" strategy. Use a number bond to help you. 34 + 52 =
What is 86?
100
Jack has 83 marbles. He gives away 24 marbles. About how many marbles does he have left?
What is 60 marbles?
100
What is 653 rounded to the nearest ten?
What is 650?
100
Name the strategy that was used in this math problem to find the answer. 783 + 357 = ? 700 + 300 = 1,000.
What is front end estimation?
100
Name a three digit number with 7 as the leading digit.
Answers will vary.
200
Add mentally. Use the "add the tens, then add the extra ones" strategy. Use a number bond to help you. 45 +23 =
What is 68?
200
Lisa has $356. She loaned $154 to her brother Tommy. About how much does Lisa have left?
What is $200?
200
874 rounded to the nearest hundred is _____.
What is 900?
200
Fill in the blank. 267 is about 270 when ____________ to the nearest ten.
What is rounded?
200
Use front end estimation to to find the sum. 395 + 467 =
What is 700?
300
Add mentally. Use the "add the tens, then subtract the extra ones" strategy. Use a number bond to help you. 34 + 48 =
What is 82?
300
John has 45 baseball cards. He buys 31 more at the store. Estimate how many baseball cards he has now.
What is 80 baseball cards?
300
499 rounded to the nearest ten is _____.
What is 500?
300
True or false- An estimate is a number that tells an exact answer.
What is false?
300
Use front end estimation to find the sum. 670 + 310 =
What is 900?
400
Subtract mentally. Use the "subtract the tens, then subtract the extra ones" strategy. Use a number bond to help you. 87 - 34 =
What is 53?
400
Joe and Sally go for a walk. Joe walks 450 meters and Sally walks 630 meters. Estimate the difference in the distances that they walk.
What is 100 meters?
400
Name five numbers that round to 870 when rounded to the nearest ten.
What is 870, 871, 872, 873, 874, 869, 868, 865?
400
Name the leading digit in the number 845.
What is 8?
400
Use front end estimation to find the difference. 468-196 =
What is 300?
500
Subtract mentally. Use the "subtract the tens, then add the extra ones" strategy. Use a number bond to help you. 63 - 48 =
What is 15?
500
Jan has 125 blocks. Her sister has twice as many blocks as Jan. Estimate the number of blocks they have altogether.
What is 400 blocks?
500
Round each number to the nearest ten and then find the difference. 647-399 =
What is 200?
500
What is the key word to look for if a question is asking you to give an estimate?
What is about?
500
Use front end estimation to find the difference. 999-569=
What is 400?
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