4th grade Math vocabulary answers

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Chapter 1

  1. cardinal number: a number that tells how many items are in a group. 

  2. expanded form: a way to write numbers by showing the value of each digit. 

  3. hundreds: 3 places values to the left.

  4. ordinal numbers: a number telling order or position. (ex. 1st, 2nd)

  5. period: each group of 3 digits in a number; a comma separates periods.

  6. round: to express a number to the nearest thousandths, hundredths, tenth, one, ten, hundred, thousand, and so on.

  7. standard form: a way to write numbers using the digits 0-9, with each digit having a place value.

  8. ten thousands: 5 places values to the left.

Chapter 2

  1. addend: any of the numbers that are added.

  2. doubles: 2 addends that are the same.

  3. front-end estimation: the method using only the front-end digits to estimate a sum, difference, product, or quotient.

  4. group: when numbers are placed together.

  5. grouping property: the property that states that the way addends or factors are grouped, does not change the answer.

  6. regroup: to exchange equal amounts.

  7. ten: 2 place values to the left.

Chapter 3

  1. array: an arrangement of objects in rows and columns.

  2. fact family: a set of related addition and subtraction or multiplication and division number sentences.

  3. inverse operations: opposite operations, such as multiplication and division, that undo each other.

  4. one: 1st place value to left.

  5. order property of multiplication: the property which states that when the order of 2 factors is changed, the product is the same.

  6. product: the answer to a multiplication problem

  7. quotient: the answer to a division problem.

  8. zero property of multiplication: the property that states that the product of zero and nay number is zero.

Chapter 4

  1. A.M.: the time between midnight and noon. (morning)

  2. bar graph: a graph that uses bars of different heights or lengths to show and compare information.

  3. digital: a type of clock that uses numbers written out to tell the time.

  4. frequency table: a table that uses numbers to show how often an item occurs.

  5. line graph: a graph that uses a line to show how something changes over a period of time.

  6. ordered pair: a pair of numbers used to locate a point on a grid.  The 1st number tells the left-right position and the 2nd number tell the up-down position.

  7. pictograph: a graph that uses pictures to show and compare information.

  8. P.M. the time between noon and midnight. (afternoon/evening)

Chapter 5

  1. calculator: an instrument used to figure out mathematical problems.

  2. estimate: to find an answer that is close to the exact answer.

  3. factor: a number that is multiplied by another number to find a product. 

  4. multiple: a number that is the product of a given number and another whole number. 

Chapter 6

  1. graph: a drawing used to show and compare information.

  2. guess: to give an educated estimate of what you think the answer will be.

  3. n: can use this to represent a missing number.

  4. pattern: used when multiplying multiples by following the pattern of zeros.

Chapter 7

  1. centimeter: (cm) a unit of length in the metric system. 100 cm=1 meter.

  2. decimeter: (dm) a unit of length in the metric system.  100 dm=1 meter.

  3. foot: (ft) a unit of length in the customary system.  12 inches=1 foot.

  4. inch: (in) a unit of length in the customary system.  

  5. kilometer: (km) a unit of length in the metric system.  1,000 meters=1 km.

  6. mass: the amount of matter of an object.

  7. meter: (m) a unit of length in the metric system. 100 cm=1 m.

  8. mile: (mi) a unit of length in the customary system.  5,280 ft.=1 mi.

  9. perimeter: the distance around a figure.

  10. yard: (yd) a unit of length in the customary system.  3 ft=1 yd. 

Chapter 8

  1. average: the number found by dividing the sum of a set by a set of numbers by the number of addends.

  2. compatible numbers: pairs of numbers that are easy to compute mentally.

  3. dividend: the number that is to be divided in a division problem.

  4. divisor: the number that divides the dividend.

  5. median: the middle number in an ordered series of numbers.

  6. quotient: the answer in a division problem.

  7. range: the difference between the greatest and the least numbers in a set of data.

  8. remainder: the amount left over when you find the quotient.

Chapter 9

  1. acute angle: an angle that has a measure less than a right angle.

  2. diameter: a line segment that passes through the center of a circle and has its endpoints on the circle.

  3. intersecting lines: two lines that cross at exactly one point. 

  4. obtuse angle: an angle that has a measure greater than a right angle.

  5. parallel lines: lines in a plane that stay exactly the same distance apart. (never touch).

  6. perpendicular lines: two lines that intersect to form right angles.

  7. plane figure: a closed figure that lies on a flat surface.

  8. radius: a line segment with one endpoint at the center of a circle and the other endpoint on the circle.

  9. similar figures: figures that have the same shape but may not have the same size.

  10. solid figures: a closed, flat shape that is all on one plane.

Chapter 10

  1. denominator: the number below the bar in a fraction.  It tells the total number of equal parts or groups into which the whole or group has been divided.

  2. equivalent fractions: two or more fractions that name the same amount.

  3. fraction: a number that names part of a whole or part of a group.

  4. like fractions: have the same denominator.

  5. mixed number: a number that is  made up of a whole number and a fraction or a whole number and another whole number.

  6. numerator: the number above the bar in a fraction. It tells how many of the equal parts of the whole are being considered.

  7. simplest form: a fraction whose numerator and denominator have no common factor greater than 1.

  8. unlike fractions: don't have the same denominator.

Chapter 11

  1. organized list: a list used to help you choose from several different choices.

  2. probability: the chance that a given event will occur.

  3. tree diagram: used to see all the possibilities.

Chapter 12

  1. decimal: a number that uses place value and a decimal point to show values less than one, such as tenths, hundredths, and so on.

  2. decimal point: a period used in decimal numbers to separate the whole number part from the decimal part.

  3. equivalent decimals: two or more decimals that name the same amount.

  4. hundredths: 3 place values to the right of a decimal point.

  5. tenths: 2 place values to the right of a decimal point.

Chapter 13

  1. compatible numbers: pairs of numbers that are easy to compute mentally.

  2. digit: a number.

  3. multiplication: the process of taking two numbers times each other.