Estimating
Combinations
Vocabulary
How Many More to 100
Word Problems
100
Estimate the sum of 374 + 248 using Front End estimation.
500
100
300 + 300 = 600 is an example of what combination?
Doubles
100
What is an equation? a. A mathematical guess. b. A mathematical expression. c. A mathematical statement that two things are equal.
C.
100
John has 99 cookies. How many more does he need to buy to have 100?
You better not have gotten this one wrong. If so, 5 tallies! ;) 1
100
Jimbo was trying to expand his game collection. he bought thirty-one games from a friend and bought six more at a garage sale. If ten of the games didn't work, how many good games did he end up with?
27
200
Estimate the sum of 375 + 240 using rounding.
600
200
233 + 1,000 is an example of what combination?
Plus 1,000
200
What is estimation? a. A mathematical guess. b. A mathematical expression. c. A mathematical statement that two things are equal.
A.
200
Carterlina has 27 dresses. She wanted 100. How many more does she need to buy?
73
200
For Halloween, Faye and her sister combined the candy they received. Faye had thirty-two pieces of candy while her sister had twenty. If they ate twenty-one pieces the first night, how many pieces do they have left?
31
300
Estimate 633 + 377 using Clustering.
One possibility is 500 + 500 = 1,000.
300
41 + 40 is an example of what combination?
Near Doubles
300
Commutative Property states: a. Changing the order of the addends does not change the sum. b. Changing the grouping of addends does not change the sum. c. If zero is added to any number, the sum will always be that number.
A.
300
Mr. Awesomeshige had 19 students. He was moved to a really big room that fit 100 students. How many more students can Ms. Ashford give Mr. Awesomeshige?
81
300
The school cafeteria ordered one hundred thirty-one red apples and forty-three green apples for student lunches. But, if only forty-four students wanted fruit, how many extra did the cafeteria end up with?
130
400
Estimate using rounding: 1733 + 259
2,000
400
56 + 9 is an example of what combination?
Plus 9
400
Associative Property states: a. Changing the order of the addends does not change the sum. b. Changing the grouping of addends does not change the sum. c. If zero is added to any number, the sum will always be that number.
B.
400
Ms. Snotson has 46 pairs of shoes. She then sells 23 pairs. After a week, she starts to regret selling her shoes and goes on a crazy shopping spree. At the end of the day, she has 100 pairs of shoes. How many pairs of shoes did she buy?
77
400
Shelby had 234 erasers and 355 pieces of candy. Looking at both, she thought the erasers looked tasty. She ended up eating 22 erasers. The taste was incredible, so much so, that she begged her dad to buy her 72 more erasers. He surprised her that night, not with 72 erasers, but with 172! How many erasers does Shelby have now?
384
500
Estimate using Front End: 399 + 799
1,000
500
4,000 + 6,000 is an example of what combination?
Make 10,000
500
What is the definition of Awesome?
Mr. Hiroshige
500
It was Leeena Hill's dream to have 100 pencils. One morning she got up really early to count her pencils, and to her excitement, found out that she had 87 pencils. However, later that day, many of her classmates asked to borrow a pencil (who knows why, probably because her classmates NEVER SHARPEN THEIR PENCILS IN THE MORNING). She kindly gave 46 pencils away. Later that day, Leeena Hill went to the school store and bought 8 pencils. Assuming she her classmates do not return her pencils, how many more does she need to get to 100 pencils?
51
500
Alexa "Four-Wheel Drive" Ford had four tires on her Ford. Then, for no reason at all, she bought 288 more tires. When her dad found out, he was really upset and said, "ALEXA 'FOUR-WHEEL DRIVE' FORD, I WANT YOU TO RETURN 50 OF THOSE TIRES!" With a heavy heart, Alexa "Four-Wheel Drive" Ford returned the tires, but saw a really fancy set of tires, and bought four of those. How many tires does Alexa have in all?
246
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