Adding and Subtracting 1 and 2 Digits
Mr. Dimas has 15 new students in his fourth-grade class. he already has 21 students in the class. How many students are in Mr. dimas’ class?
21 + 15 = 36
Write this number in expanded form.
608
600 + 8
294
+ 103
?
294 + 103 = 397
List the factors of each number. Then, label each number as a prime or composite.
36
1 × 36 = 36
2 × 18 = 36
3 × 12 = 36
4 × 9 = 36
6 × 6 = 36
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
Since 36 has more than two factors, it is composite.
4,000 ÷ 400 = ?
4,000 ÷ 400 = 10
28
+ 57
?
28 + 57 = 85
Write the number word.
985,685
Nine hundred eighty-five thousand, six hundred eighty-five
2012
150
+ 150
?
2012 + 150 + 150 = 2312
Chris walked 4 miles a day for 21 days. How many miles did he walk in all?
Chris walked 84 miles in all.
Use LONG DIVISION to solve
7 ÷ 28
28 ÷ 7 = 4
27
32
+ 43
?
27 + 32 = 59
59 + 43 = 102
Write the numerical value of the digit in the hundreds place.
995
Its numerical value is:
900
Over the weekend the Midmark Theater sold 1,208 buckets of popcorn, 2,543 sodas, and 973 boxes of candy. How many food items did the thater sell?
Popcorn + Sodas: 1,208 + 2,543 = 3,751
Add Candy: 3,751 + 973 = 4,724
The theater sold 4,724 food items.
48
x 9
?
48 × 9 = 432
Mr. Luiz printed 35 tests for his students. If there were 7 rows of students, how many tests were passed out to each row?
35÷7=5
Each row received 5 tests.
177
- 98
?
177 − 98 = 79
Round to the nearest ten thousand.
184,564
Ten-thousands digit: 8
Thousands digit: 4 (less than 5, so round down)
184,564 rounded to the nearest ten thousand is 180,000
A baseball team gave away free hats to 10,917 fans. There were 13,786 people at the game. How many fans did not get a free hat?
13,786 − 10,917
Ones: 6 − 7 → borrow 1 → 16 − 7 = 9
Tens: 7 − 1 = 6
Hundreds: 7 − 9 → borrow 1 → 17 − 9 = 8
Thousands: 2 − 0 = 2
2,869 fans did not get a free hat.
There are 58 chicken farms near an Ohio town. If each farm has 9 barns, how many total barns are there?
50 × 9 = 450
8 × 9 = 72
Add them: 450 + 72 = 522
There are 522 barns in total.
Use LONG DIVISION to solve
9 ÷ 372
372 ÷ 9 = 41.333…
Isabel Jones needs to sell 175 calendars to raise money for the school band. She already sold 89 calendars. How many more calendars does she have to sell?
She needs to sell 175 calendars total and has already sold 89.
So we subtract:
175 − 89 = 86
Isabel needs to sell 86 more calendars.
Compare the numbers.
Use >, <, or =.
1,365,333 _ 1,356,333
The millions and hundred-thousands digits are the same.
The ten-thousands digit: 6 > 5
1,365,333 > 1,356,333
99895
+ 75872
?
99,895 + 75,872 = 175,767
If 16 potato chips is a serving size and there are 5 servings per bag, how many potato chips are in each bag?
16×5=80
There are 80 potato chips in each bag.
Use LONG DIVISION to solve
8 ÷ 4,304
4304 ÷ 8 = 538