Addition/Subtraction
1530 + 82 =
1530 + 82 = 1612
8 x 7 =
8 x 7 = 56
75 / 3 =
75 / 3 =
A square has a perimeter of 68 inches.
What is the length of one side?
One side = 17 inches
Suppose it is now 3:00 PM. What time will it be in 248 hours? Label your answer with AM or PM.
Answer: 11:00 PM
In 24 hours (1 day), it will again be 3:00 PM.
In 240 hours (10 days), it will again be 3:00 PM.
There are 8 extra hours, so 3:00 + 8:00 = 11:00 PM.
1498 + 502 =
1498 + 502 = 2000
80 x 80 =
80 x 80 = 6400
168 / 12 =
168 / 12 = 14
What is the width?
Width = 80 yards
A pattern starts 1, 1, 2, 3, 5, 8. What is the 8th number in the pattern?
Answer: 21
The first two numbers are 1 and 1, and every other number is the sum of the two numbers before it.
7th number = 5 + 8 = 13 [trap answer]
8th number = 8 + 13 = 21
738 - 449 =
738 - 449 = 289
16 x 180 = 2880
504 / 72 =
504 / 72 = 7
A rectangle has a perimeter of 200 feet. The width is 60 feet.
What is the Area of the rectangle?
Area = 2400 feet2
A farmer has 28 feet of fencing to use to make a rectangular face. What is the maximum possible area for the rectangular fence?
Answer: 49 feet2
If you play around with the side lengths, you will see that the maximum possible area can be made with a square. Then 28 feet of total perimeter equates to 28 4 = 7 feet per side. Then the area is 7 feet 7 feet = 49 feet2
1855 - 1566 =
1855 - 1566 = 289
203 x 308 =
203 x 308 = 62524
4960 / 16 =
4960 / 16 =310
Whats the length of each side?
Each side = 357 meters
Six students are in a chess tournament. Every student plays every other student one time. How many total chess matches take place?
Answer: 15
Call the students A, B, C, D, E, and F.
A plays 5 other students (B, C, D, E, and F).
B plays 4 other students not counted above (C, D, E, and F) – because B already played against A.
C plays 3 other students (D, E, and F)
D plays 2 other students (E and F)
E plays 1 other student (F).
In total, there are 5 + 4 + 3 + 2 + 1 = 15 total matches.
12024 - 1486 + 284 =
12024 - 1486 + 284 = 10822
9237 x 404 =
9237 x 404 = 3,731,748
4683 / 21 =
4683 / 21 = 233
A rectangle has an area of 1200 units2. The perimeter is 160 units.
What are the length and width of the rectangle?
20 units x 60 units
What is the 3,022nd digit after the decimal in the repeating decimal 0.50184501845018450…
Answer: 0
Every five digits repeat as 5-0-1-8-4. Then every 5th digit (5, 10, 15, 20, etc.) is a 4. Then the 3020th digit is a 4, and therefore the 3021st digit is a 5 and the 3022nd digit is a 0.