3 + 1 = 4. First Grade. Addition: Combining two or more numbers to find a total.

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1 First Grade 425 Addition: Combining two or more numbers to find a total. + = = 4 Arithmetic: The basic math that we do in everyday life involving addition, subtraction, multiplication and/or division. (the arithmetic operations are +,,, ). Backward/ forward: Directional words indicating the way one is facing (forward) or the opposite direction which one is facing (backward). Arithmetic problems: 4+ 5= = 3 5 2= 3 2 3= 6 The children are running forward. The woman is bending backward. Between: An intermediate point between two places. The square is between the two circles. Chart (100s): A chart displaying the numbers from one to one hundred. It can be used to find patterns, skip count, add, subtract etc. Use the hundred s chart to skip count by fives.

2 Commutative law: The order in which two numbers are added is not important. (However, order matters, it is important for subtraction; so subtraction is not commutative.) 426 Compose/decompose: Put together/take apart.. The hexagon is composed of six triangles. Counting On/ Counting Back: A strategy used in solving an addition or subtraction problem. The trapezoid can be decomposed into a triangle and a rectangle. To solve using the counting on strategy, a student will say 6 and then count on 3 more by saying 7, 8, 9. Cube: A 3-dimensional figure with six square faces. Data: Information that is gathered by counting, measuring, asking questions or observing. Picture graph: Digit: One of the number symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9. The numeral 96 has two digits. Estimate/guess (measurement): An answer that is close to an exact answer. Because Emily s book was 9 paper clips long, she estimated that it was about 9 inches long.

3 Even/odd: An even number is a number that is evenly divisible by 2; any number that can be shared equally among two groups; an odd number of items cannot be shared equally among two groups. Face (in relation to 3-d figure): A flat surface (a side) on a 3-dimensional shape. Facts: The basic addition and subtraction sentences with sums up to 20. Fraction (parts/whole): A number that names parts of a whole or a group. 2, 10, and 24 are examples of even numbers. 5, 9, and 17 are examples of odd numbers. A cube has six faces. Each one is a square. Fact Family: 3+ 4= 7, 4+ 3= 7, 7 3= 4, 7 4= 3 In the fraction ¼: 1 is the part and 4 is the whole. 427 Greater than: Describes the bigger number or quantity 8 is greater than 5, 8 > 5 Grouping: Arranging objects or numbers in clusters so that they are easier to count, add, or subtract. Grouping by twos, fives or tens is often useful. Half-hour: Describes the two equal parts of the hour created when starting at zero minutes and counting thirty minute increments, such as 2:00 and 2:30. Inch: A basic unit of length in the US measurement system. 11:30 One inch is about Eleven-thirty is sometimes called half past eleven centimeters. inch Length: The distance from end to end. The length of this ruler is 6 inches.

4 Less than: Describes the smaller number or quantity. Measure: To find a number that shows the size or amount of something. 5 is less than 8; 5 < 8 The ruler is used to measure the blue segment which is about 3 inches long. 428 Minute: A period of 60 seconds; there are 60 minutes in one hour. The minute hand is longer than the hour hand on a clock. This clock shows a time of 5 minutes after 5 o clock. Number Line: A line which shows numbers placed in their correct position; it can be used to show relationships between numbers. Number Sentence: A numerical statement using mathematical symbols; an arrangement of numbers and symbols to show an addition or subtraction fact. Place value: The value of a digit according to its position in a number =10 is a number sentence. In the numeral 25, the place value of the 2 is 2 tens or twenty and the place value of the 5 is 5 ones. Pound: A unit used to measure weight in the US system. This man is standing on the scale to see how many pounds he weighs. He weighs about 200 pounds. Quarter-hour: Describes the four equal parts of the hour created when starting at zero minutes and counting fifteen minute increments, such as 2:00, 2:15, 2:30 and 2:45. 10:15 The clock shows it is a quarter after ten o clock.

5 Rule: A description or formula which results in the continuation of a picture or number pattern. 429 Sequence: Numbers or objects arranged in a particular order. 2, 4, 6, 8, 10, 12 is a sequence of (even) numbers. Solve: To find the answer to a question or puzzle. Standard/ Non-Standard unit: Standard units are widely accepted units of measurement such as the US system or Metric system. Non-standard units are measurements made using common objects such as paper clips, hand span etc. Subtraction: Taking one number away from another. A mathematical operation that finds the difference between two numbers or quantities. Solve the equation: 2+ = 5 Using a tape measure to find the length of a shelf in inches is an example of using a standard unit of measure. 5 2 = 3 Sum: The total resulting when two or more numbers are added; the answer in an = is the sum addition problem. of 7 and 3 Symbol: A picture or image used to represent something. + means to add Temperature: How hot or cold an object The temperature is. outside is about 30 degrees.