Definitions
When a problem asks you to find the sum, is it addition or subtraction?
157 + 422 =
579
782 - 321
461
What information is unnecessary? You do not need to solve.
The ice cream store has 64 dairy flavors, 18 non-dairy flavors, and 12 toppings available. How many ice cream flavors in all?
A. 64 dairy flavors
B. 18 non-dairy flavors
C. 12 toppings
C. 12 toppings
This morning, there were 26 gold fish and 32 tigerfish in an aquarium. At noon, 17 fish were sold. How many fish are left in the aquarium?
41 fish are left at the aquarium.
Step one: 26+32 = 58
Step two: 58-17=41
When a problem asks you to find the difference, is it addition or subtraction?
subtraction
359 + 234
593
730 - 432
298
The Empire State Building is 1,454 feet tall. The Chrysler Building is 1,048 feet tall. How much taller is the Empire State Building than the Chrysler Building?
The Empire State Building is 406 feet taller than the Chrysler Building.
1,454-1,048 = 406
Hannah's book has 382 pages. On Monday, she read 125 pages. On Tuesday, she read 74 pages. How many pages does she have left?
Step one: 382 - 125 = 257
Step two: 257 - 74 = 183
When a question asks how much or how many more, is it addition or subtraction?
subtraction
321 + 592 + 28
941
802 - 526
276
Jack and Jill ran a race. Jack finished the run in 19 minutes, Jill finished in 24 minutes. How many more minutes did Jill run than Jack?
100 bonus points: Who won the race?
Jill ran for 5 more minutes than Jack. Jack won the race.
Rubin has 18 presents. Sophie has 35 more presents than Rubin. How many do they have all together?
Rubin and Sophie have 71 presents in all.
Step one: find out how many presents Sophie has (18+35 = 58)
Step two: add Sophie's presents and Rubin's presents (58+18 = 71)
Where should the commas go in the number 42983?
42,983
Between the thousands and hundreds place!
23,478 + 5,609
29,087
6,000 - 482
5,518
Netflix has 6,206 movies and TV shows available to stream. 3,108 of the movies and shows are Netflix originals. Hulu has 4,150 shows and movies. How many movies and shows on Netflix are not Netflix originals?
3,098 shows and movies are not Netflix originals.
6,206-3,108 = 3,098
The number of shows on Hulu is unnecessary information.
There are 167 people on the train. At the first stop, 43 more people got on the train. Then, 78 people got off the train. How many people are on the train?
132 people are left on the train.
Step-one: 167+43=210
Step-two: 210-78=132
What does it mean to regroup? How do you know when you need to regroup?
Regrouping happens when you have too many in one place value OR need more in one place value.
412,091 + 614,989
1,027,080
2,000,000 - 318,235
1,681,765
Justin had 1,000,000 saved. He spent 482,999 dollars on a new house. How much money does he have left?
Justin has 517,001 dollars left.
1,000,000 - 482,999 = 517,001
There are 208 students at Shefa. 58 lower school students and 27 middle school students order school lunch. Everyone else brings lunch from home. How many students bring lunch from home?
123 students bring lunch from home.
Step one: 58+27 = 85
Step two: 208 - 85 = 123