Vocabulary
A letter that represents an unknown quantity.
Variable
39,491 + 56,356
95,847
6,763 - 5498
1,265
Estimate: 2,843 + 4,923 = ? (*hint* round each number to the thousands place, then add)
8,000
An office building sells for $350,000. A house nearby sels for $245,600. How much more does the office building sell for?
$104,400
A way of doing something in math. It is a set of steps that, if done correctly, always works.
Algorithm
10,252 + 1,298
11,550
71,395 - 6,627
64,768
3,256 + 1,982 = x (*hint* round each number to the thousands place, then add)
5,000
A carnival booth has $620. They earn $525 selling popcorn and $162 selling drinks. They spend $365 to order more supplies. Write an equation to show how much money the concession stand has now.
620 + 525 + 162 - 365 = m
You can use this to add numbers. Add one place value at a time, and then add those sums to find the total sum.
Partial Sums
5,917 + 9,352
15,269
19,516 - 2,921
16,595
Estimate: 3,701 + 1,812 + 2,085
8,000
A bakery sold 1,353 muffins on Friday and 2,231 muffins on Saturday. How many muffins did the bakery sell?
3,584 muffins
When you keep the front, or leftmost, digit and all other digits become zeros.
Front-end estimation
52,110 + 16,209
68,319
213,418 - 9951
203,467
Estimate: 18,801 + 61,290 (*hint* round to the ten thousands place, then add)
80,000
A theater has 1,485 tickets to sell. They sell 691 tickets for main floor seats and 478 tickets for balcony seats. There are 184 tickets still available for the balcony. How many tickets are still available for main floor seats?
132 seats
To use place value to exchange equal amounts when renaming a number.
Regroup
Decompose BOTH addends THEN solve: 6,411 + 1,281
6,000 + 400 + 10 + 1 + 1,000 + 200 + 80 + 1
Answer: 7,692
Decompose 48,291 - 24,181 then, SOLVE
24,181 = 20,000 + 4,000 + 100 + 80 + 1
Answer: 24,110
At OCASA, if there are 82 students in yellowband, 94 students in orangeband, and 98 students in redband, about how many students are there at OCASA? (*hint* round the tens place, then add)
270 students
There are 551 cars parked in the mall parking structure. The first level has 128 empty spaces. The second level has 294 empty spaces. The third level has 302 empty spaces. How many spaces are in the parking garage?
1,275 spaces