Multiplying

Multiplication is a mathematical operation that scales one number by another (multiplying – sign: x). It replaces addition of a large quantity of numbers in a row. Multiplying is a math operation that is opposite of division. For example: you can substitute the mathematical expression 5+5+5+5 with 5×4 (the number 5 multiplied with the number of times it has appeared in a row).

Multiplication has several properties. When a number is multiplied with the number 1, the product (the result of multiplication) is the same as that number. When a number is multiplied with zero, the product is always zero. When a number is multiplied with negative one, the result is the negative version of that number.  It also has properties of commutativity, associativity and distributivity.

The commutative and associative properties are similar to those properties in addition. Distributivity applies when addition and multiplication are combined, as they are in this example:

a * (b + c) = a * b + a * c

A very important thing to remember is that the order of importance of multiplication is always greater than the order of importace of addition or subtraction. You first multiply the numbers (where there is need for that) and them add or subtract them. Here is an example:

5 * 4 + 3 = 20 + 3 = 23

The single exception to the rule is that addition or subtraction has priority over multiplication when  the numbers that need to be added and the operator are in brackets, and the operator of multiplication is not.

multiplication

Multiplying exams for teachers

Exam Name File Size Downloads Upload date
Positive integers
Multiplying positive integers – very easy 78 kB 1993 October 13, 2012
Multiplying positive integers – easy 143 kB 2054 October 13, 2012
Multiplying positive integers – medium 166.3 kB 2158 October 13, 2012
Multiplying positive integers – medium-hard 173.1 kB 1819 October 13, 2012
Multiplying positive integers – hard 561.5 kB 1407 October 13, 2012
Multiplying positive integers – very hard 571.8 kB 1569 October 13, 2012
Positive decimals
Multiplying positive decimals – very easy 554.5 kB 1321 October 13, 2012
Multiplying positive decimals – easy 555.5 kB 1278 October 13, 2012
Multiplying positive decimals – medium 579.2 kB 1178 October 13, 2012
Multiplying positive decimals – medium-hard 580.2 kB 1064 October 13, 2012
Multiplying positive decimals – hard 569.5 kB 1196 October 13, 2012
Multiplying positive decimals – very hard 567.2 kB 1082 October 13, 2012
Positive fractions
Multiplying positive fractions – very hard 567.2 kB 1082 October 13, 2012
Multiplying positive fractions – very easy 172.7 kB 1582 October 13, 2012
Multiplying positive fractions – easy 188.9 kB 1310 October 13, 2012
Multiplying positive fractions – medium 577.2 kB 1171 October 13, 2012
Multiplying positive fractions – medium-hard 591.9 kB 1079 October 13, 2012
Multiplying positive fractions – hard 575.7 kB 1075 October 13, 2012
Multiplying positive fractions – very hard 581 kB 1074 October 13, 2012
Positive mixed numbers
Multiplying positive mixed numbers – very easy 176.8 kB 1173 October 13, 2012
Multiplying positive mixed numbers – easy 209.8 kB 1161 October 13, 2012
Multiplying positive mixed numbers – medium 585.6 kB 1065 October 13, 2012
Multiplying positive mixed numbers – medium-hard 592.9 kB 1045 October 13, 2012
Multiplying positive mixed numbers – hard 589.3 kB 1040 October 13, 2012
Multiplying positive mixed numbers – very hard 596.6 kB 1012 October 13, 2012
Positive improper fractions
Multiplying positive improper fractions – very easy 166 kB 1057 October 13, 2012
Multiplying positive improper fractions – easy 169.9 kB 1161 October 13, 2012
Multiplying positive improper fractions – medium 571.6 kB 1035 October 13, 2012
Multiplying positive improper fractions – medium-hard 569.5 kB 1047 October 13, 2012
Multiplying positive improper fractions – hard 560.5 kB 982 October 13, 2012
Multiplying positive improper fractions – very hard 571.8 kB 1020 October 13, 2012
Non positive integers
Multiplying integers – very easy 137.9 kB 1565 October 13, 2012
Multiplying integers – easy 143.6 kB 1441 October 13, 2012
Multiplying integers – medium 173.3 kB 1445 October 13, 2012
Multiplying integers – medium-hard 173.5 kB 1368 October 13, 2012
Multiplying integers – hard 565.9 kB 1217 October 13, 2012
Multiplying integers – very hard 568 kB 1108 October 13, 2012
Non positive decimals
Multiplying decimals – very easy 186.6 kB 1287 October 13, 2012
Multiplying decimals – easy 187 kB 1501 October 13, 2012
Multiplying decimals – medium 578.8 kB 1063 October 13, 2012
Multiplying decimals – medium-hard 577 kB 982 October 13, 2012
Multiplying decimals – hard 564.9 kB 1046 October 13, 2012
Multiplying decimals – very hard 567.9 kB 1025 October 13, 2012
Non positive fractions
Multiplying fractions – very easy 179.6 kB 1079 October 13, 2012
Multiplying fractions – easy 186.7 kB 1252 October 13, 2012
Multiplying fractions – medium 583.8 kB 1045 October 13, 2012
Multiplying fractions – medium-hard 589 kB 1009 October 13, 2012
Multiplying fractions – hard 588 kB 978 October 13, 2012
Multiplying fractions – very hard 594.9 kB 998 October 13, 2012
Non positive mixed numbers
Multiplying mixed numbers – very easy 192.9 kB 1003 October 13, 2012
Multiplying mixed numbers – easy 209 kB 1133 October 13, 2012
Multiplying mixed numbers – medium 594.7 kB 1033 October 13, 2012
Multiplying mixed numbers – medium-hard 602.2 kB 925 October 13, 2012
Multiplying mixed numbers – hard 586.3 kB 957 October 13, 2012
Multiplying mixed numbers – very hard 591.3 kB 938 October 13, 2012
Non positive improper fractions
Multiplying improper fractions – very easy 171.2 kB 950 October 13, 2012
Multiplying improper fractions – easy 174 kB 963 October 13, 2012
Multiplying improper fractions – medium 574.7 kB 984 October 13, 2012
Multiplying improper fractions – medium-hard 573.9 kB 906 October 13, 2012
Multiplying improper fractions – hard 570.7 kB 945 October 13, 2012
Multiplying improper fractions – very hard 577.4 kB 947 October 13, 2012

 

Multiplying worksheets for students

Worksheet Name File Size Downloads Upload date
Positive
Multiplying positive integers 496.1 kB 1646 October 14, 2012
Multiplying positive decimals 51.8 kB 1238 October 14, 2012
Multiplying positive fractions 632.1 kB 1066 October 14, 2012
Multiplying positive mixed numbers 637.8 kB 1245 October 14, 2012
Multiplying positive improper fractions 594.6 kB 980 October 14, 2012
Non positive
Multiplying integers 166.8 kB 1246 October 14, 2012
Multiplying decimals 246.3 kB 1134 October 14, 2012
Multiplying fractions 393.1 kB 1103 October 14, 2012
Multiplying mixed numbers 412.4 kB 1063 October 14, 2012
Multiplying improper fractions 334.1 kB 1016 October 14, 2012


Multiplying knowledge test