Find here many important 4th grade math concepts taught in 4th grade. Teachers, parents, and math tutors can also use them as a guideline to illustrate a math lesson or to teach important skills that kids are supposed to know in 4th grade math.

 Decimal notation for fractions RayA ray has one endpoint where it starts and it extends forever on the other side. Add mixed numbers Comparing fractions Read whole numbers Which number can be read as six thousand, four hundred eighty-seven?    A. 64087         B.    6087               C. 6487          D.     8764
 Read whole numbers Which number can be read as six thousand, four hundred eighty-seven?A. 64087     B.    6087           C. 6487       D.     8764
 Proper fractionNumerator is smaller than denominatorImproper fractionNumerator is bigger than denominator. Right triangleA right triangle has one right angle. Benchmark fractionsFractions that are used frequently to do estimation. Congruent shapesShapes are congruent when they have the same shape and size. Common denominatorMultiples of 3 are 3, 6, 9, 12, 15, ...Multiples of 4 are 4, 8, 12,16, ...Common denominator is least common multiple or 12. Subtraction algorithm                       4    5    6 -    3    9    8____________ 4   16                                  4    5    6                          -      3    9    8                          ___________                                             8                               3   1 4  16                                 4     5    6                            -  3     9    8                           __________                               0     5    8
 Subtraction algorithm                                4    5    6          -    3    9    8           ________________ 4   16                            4    5    6     -         3    9    8          ________________                           8             3   1 4  16               4    5    6      -      3    9    8          ________________             0    5    8
 Line of symmetry ProtractorA geometric tool used to draw and measure angles ArcAn arc is a part of a circle. The arc is shown in orange. Algorithm for multiplication Measure of an angleThe angle on the right measures 150 degrees 150 degrees

 Equation A mathematical sentence with an equal sign. The equal sign separates the left side from the right side. The amount on the left side of the equation is always equal to the amount on the right side. 4  + 6 = 10                                1 + 12 = 13                                20 = 9 + 11
 Equation A mathematical sentence with an equal sign. The equal sign separates the left side from the right side. The amount on the left side of the equation is always equal to the amount on the right side. 4  + 6 = 10           1 + 12 = 13           20 = 9 + 11

 Tenth  and hundredthTenth: one of the equal parts when a whole is divided into 10 equal parts.Hundredth: one of the equal parts when a whole is divided into 100 equal parts HundredthsThe hundredths place is shown in red. The 9 means that 9 parts are colored out of 100. 8.29
 Intersecting lines Comparing decimals Put the following decimal in order from greatest to least.4.23    4.24    4.2    4.30    4.19Answer :4.30    4.24   4.23    4.20   4.19
 Mixed numberA mixed number has 2 parts. First it has a whole number that is 2. Second, it has a fraction that is 4/5 Formulas Area and perimeter of a rectangle Area  = length x widthPerimeter = 2 x length + 2 x width

 CircleIn a circle, you can put points anywhere on the purple arc. These points will be at the same distance from the fixed black point called center. TenthsThe tenths place is shown in red. The 2 means that 2 parts are colored out of 10. 8.29

 Composite numberA number with more than 2 factors. Factors of 8 are 1, 2, 4, and 8.8 is a composite number since it has 4 factors or 4 numbers than can divide it evenly 12, 9 and 8

 Factor pairsA factor pair refers to a set of two numbers when multiplied will yield a specific product. Factor pairs of 12            are  (1,12), (2, 6),             and (3, 4)
 Factor pairsA factor pair refers to a set of two numbers when multiplied will yield a specific product. Factor pairs of 12           are (1,12), (2, 6),            and (3, 4)

 Obtuse angleAn angle bigger than 90 degrees Decimal 10.50      5.25      61.0     0.40       .333

 Number lineA straight line on which we put 0 and counting numbers ReasonablenessThere is no need to do the math. Instead use estimation to eliminate answers that are unreasonable.50 times 30 = 1500, therefore, the answer is 1551 What is the product             of 47  times  32?            A. 4514    B. 1551            C. 2947    D. 8114

 Multiplicative comparisonPeter has 5 times 4 = 20. Together they have 20 + 4 = 24 John has 4 tennis ball.                    Peter has 5 times as many                   tennis ball as John.                   How many tennis ball do                    they have together?
 Multiplicative comparisonPeter has 5 times 4 = 20.Together they have20 + 4 = 24 John has 4 tennis ball.     Peter has 5 times as   many tennis ball as John.  How many tennis ball do   they have together?

 PerimeterPerimeter = 2 x length + 2 x width                  =  2 x 6 + 2 x 2                  =  12 + 4                  = 16Area          =  6 x 2 = 12 Solve an equation What is the value   of b in the equation    below?   5 + b = 12   Since 5 + 7 = 12,     b = 7

 1 ounce A slice of breadA CD without the case2 or 3 strawberries depends on the size
 Pattern:What is the next number in the list? 12    15    18

 Decompose a fraction 3/5  = 1/5 + 1/5 + 1/5
 Decompose a fraction 3/5  = 1/5 + 1/5 + 1/5

 Example of prime numbersA prime number is a number that has only 2 factors, 1 and the number itself. 7 is a prime number because only 1 and 7 can be multiplied to get 7 5, 7, and 13

 Decimal pointThe decimal point is the dot (.) separating the whole number from the fraction in the decimal notation. Equivalent fractions Order of operations 3 + (2 + 4) x 5                       Do parenthesis                        3 + 8 x 5                      Do multiplication                       3 + 40                        Add                         43
 Order of operations 3 + (2 + 4) x 5        Do parenthesis              3 + 8 x 5       Do multiplication              3 + 40        Add         43

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