Level 19 Level 21
Level 20

Place Value, Rounding & Algorithms for Addition &

41 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

additive comparison
Problems that ask how much more (or less) one amount is than another
associative property of addition
When the grouping of terms changes, the sum stays the same.
any number being added
a picture that uses rows (---) and columns (I) to show a multiplication problem
two combine, put together two or more quantities
a step-by-step method for computing
used to represent larger & smaller amounts in a comparison situation
To decide if one number is greater than, less than, or equal to.
A collection of information gathered for a purpose. Data may be in the form of either words or numbers.
commutative property of addition
If the order of the terms changes, the sum stays the same.
To put together components or basic elements.
to separate into components or basic elements
the answer to a subtraction problem
Any of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.
A mathematical sentence that contains an equals sign
having the same value
fact family
A group of related facts that use the same numbers. Also called related facts.
A mathematical phrase without an equal sign.
expanded form
the number written using addition for each place value.
To find the value of a mathematical expression.
greater than
>; the number to the left of the sign is MORE than the number to the right
less than
<; the number to the left is FEWER than the number to the right
line plot
A diagram showing frequency of data on a number line.
Identity Property of Addition
The sum of 0 and any number is that number.
number line
a diagram that represents numbers as points on a line.
multiplicative comparison
Compare by asking or telling how many times more one amount is as another.
place value
The way that the position of a digit in a number tells us its value
A repeating or growing sequence or design. An ordered set of numbers or shapes arranged according to a rule.
In a large number, periods are groups of 3 digits separated by commas or by spaces.
related facts
Related addition and subtraction facts or related multiplication and division facts. Also called fact family.
round a whole number
To find the nearest ten, hundred, thousand, (and so on).
the answer to an addition problem
An answer that is based upon good number sense.
an operation that gives the difference between two numbers
A set of numbers arranged in a special order or pattern.
standard form
the number written with digits
The difference between the greatest number and the least number in a set of data.
word form
A way of using words to write a number.
an alphabetic character representing a number, called the value, which is either arbitrary or not fully specified or unknown. It is usually a letter like x or y.
Whole Numbers
Zero and the counting numbers 1, 2, 3, 4, 5, 6, and so on. If a number has a negative sign, a decimal point, or a part that's a fraction, it is NOT a whole number.