Grade 1 Vocabulary Definitions
Add - To bring two or more numbers (or things) together to make a new total.
Here 1 ball is added to 1 ball to make 2 balls.
Plus - Another word for add
Example: 30 cents plus 20 cents equals 50 cents.
The symbol is +
Sum - The result of adding two or more numbers.
Example: 9 is the sum of 2, 4 and 3, because 2 + 4 + 3 = 9.
Afternoon – The time after 12 noon until 6 P.M.
Bar graph - A graph drawn using rectangular bars to show how large each value
is. The bars can be horizontal or vertical.
Below – A number that is less than another number on a scale.
Example: A temperature of 6°F is below 10°F (Burrrrr…)
Calendar - A diagram that shows what day and month it is.
Cent ¢ - smallest money value in the U.S. 100 ¢ = one dollar.
Circle - A 2-dimensional shape made by drawing a curve that is always the same
distance from a center.
Cone - A solid (3-dimensional) object that has a circular base and one
vertex (point on top). Example: An ice cream cone.
Cube - A cube is a box-shaped solid object that has six identical square faces.
Examples: Two dice are each in the shape of a cube.
Cylinder - A cylinder is a solid object with:
* two identical flat circular ends
* and one curved side.
Examples: A can of coke, a can of corn, a hockey puck
Minute - A unit of time equal to 60 seconds.
There are 60 minutes in an hour.
Hour - Day = 24 Hours
1 Hour = 60 minutes.
Example: The amount of time between 5:00 and 6:00 is 1 hr.
Day - The 24 hour period from midnight to the next midnight.
It is how long the Earth takes to spin once on its axis.
Month - One of the twelve parts of the year:
January, February, March, April, May, June, July, August, September, October,
November, December
Example: The month of May -
Difference - The result of subtracting one number from another. How much
one number differs from another.
Minus - Subtract. Take away. Decrease by.
Example: 8 minus 3 is equal to 5.
8-3=5
Digit - Any of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 used to write
numbers. For example, the digits in the number 361 are 3, 6, and 1.
Penny - one cent. The smallest money value.
100 pennies make one dollar
Nickel - Equal to 5 pennies or 5 cents
Dime - Equal to 10 pennies or 10 cents
Quarter – Equal to 25 cents or 25 pennies. Below is the front and back of a
quarter.
2 quarters
Dollar – Equal to 100 cents or 100 pennies.
$1.00 = 100¢
Equal - Exactly the same amount or value
Examples:
3 + 4 is equal to 7
1 Dollar is equal to 100 Cents
The symbol is
=
Foot - A measure of length equal to 12 inches.
Inch – A inch is a small measure of length. From 0-1 above = 1”
Half – One of two equal parts of a whole.
Jim and I ate one-half of the pizza or ½ of the pizza.
Ones – The units place value. Given the number 76, the 6 is in the
ones or units place
Tens – Given the number 76, the 7 is in the tens place.
Less – Smaller. 4 is smaller than 7.
Greater – Bigger. A larger amount. 7 is greater than 4.
Even number – Any integer that can be divided exactly by 2.
The last digit will be 0, 2, 4, 6 or 8
Example: 0, 6 and 38 are all even numbers
If it is not an even number, it is called an odd number
Odd number - Any integer that can not be divided exactly by 2.
The last digit will be 1, 3, 5, 7 or 9
Example: 1, 7 and 35 are all odd numbers
If it is not an odd number, it is called an even number.
Square – A four sided shape ( a flat shape with straight sides) where all sides
have equal length and every angle is a right angle (90°).
Examples: Squares on a checker board. Bases on a baseball field.
Rectangle – A rectangle is a 4-sided shape (a flat shape with straight sides)
where every angle is a right angle (90°)
Triangle - A 3-sided polygon (a flat shape with straight sides).
Example: The yield sign on a road.
Example: A slice of pizza
Whole number - The numbers {0, 1, 2, 3, …} etc.
There is no fractional or decimal part.
Example: 5, 49 and 980 are all whole numbers.
Compare - To evaluate side by side. Example: Compare the number of sides of
a triangle and a square. A square has four sides while a triangle has three
Thermometer - An instrument used to measure temperature (how hot or
cold something is). Below is a thermometer with a scale for degrees Fahrenheit
(°F) on the left and degrees Celsius (°) on the right. Outside and inside
temperature is measured in °F in the U.S.
Volume -
The amount of 3-dimensional space an object occupies. Capacity.
Example: The amount of milk in a gallon container.
References:
Pierce, Rod. "Illustrated Mathematics Dictionary" Math Is Fun. Ed. Rod Pierce. 24
Jun 2010. 25 Sep 2010 <http://www.mathsisfun.co - To evaluate side by side.
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