Precision of Language
The answer to a subtraction problem.
Difference
9 rounded to the nearest 10
10
This is the way we typically represent a number.
Standard Form
289 + 621 = 621 + ______
289
Grayson is working on a math problem and adjusts both numbers by subtracting 2 from each. Is Grayson working on an addition problem or a subtraction problem?
Subtraction
To break a number into smaller pieces
Decompose
21 rounded to the nearest 10
20
This number form takes the longest to write down.
78 + ______ + 212 = 418 + 212 + 78
418
What strategy calls for the decomposition of addends before finding their sum?
Partial Sums
What you do when an exact answer is not required
Estimate
49 rounded to the nearest 100
0
This form requires the knowledge of place value to do correctly.
Expanded Form
The sum of two numbers that are both odd will always be ________.
even
Sasha spend 284 minutes swimming the first week and 247 minutes the second week. What is an estimate of the total time Sasha spent swimming?
500 minutes; 530 minutes; 480 minutes; 550 minutes
Adjusting a number up or down to make a friendly number.
Rounding
794 rounded to the nearest 10
790
Write down the standard form of three thousand, eight hundred forty.
3,804
The sum of an odd number and an even number will always be __________.
Odd
Gabe is trying to solve 246 + 367. Write an equation that shows how he could adjust the addends to find the sum.
250 + 363 = ?
243 + 370 = ?
The representation of a number as a sum of the values of each digit.
Expanded Form
True or False: 51 can be rounded to both 50 and 100.
True
Write the following number in expanded form and word form. 126
100 + 20 + 6
One hundred twenty six
True or False: It doesn't matter in which order you place your addends; the sum will still be the same.
True
Write a set of equations for the following:
Enrique read 249 pages of his book in June and 227 pages of his book in July. The book has a total of 638 pages and Enrique wants to know how many pages he has left to read.
249 + 227 = 476
638 - 476 = 162