Least Common Multiple - normal

Practice Least Common Multiple (LCM) - normal

LCM is the smallest non-zero number that is a multiple of two or more numbers. Least Common Multiple is an important skill for addition and subtraction of fractions with unlike denominators.

Students will train LCM mental skills for two numbers. The maximum LCM value is 144.

Least Common Multiple (LCM) - advanced

Practice Least Common Multiple (LCM) - advanced

Build Least Common Multiple skill for two or three numbers. The maximum LCM value is 144.

Progress report

The report shows the learning progress in percentage (0% - not learned, 100% - learned well).
There are three levels of the report.

Short report

LCM normal (two numbers): 18%
LCM advanced: 22%

Normal report

The normal report shows the progress for two or three numbers. For example LCM(x1,x4) is a family consisting of LCM(1,4), LCM(2,8), LCM(3,12), ...
LCM(x1,x2,x4) is LCM(1,2,4), LCM(2,4,8), LCM(3,6,12), ...

LCM normal. Done: 18%

LCM(x1,x2)17% LCM(x1,x3)23%
LCM(x1,x4)23% LCM(x1,x5)18%
LCM(x1,x6)20% LCM(x1,x7)17%
LCM(x1,x8)22% LCM(x1,x9)18%
LCM(x1,x10)17% LCM(x2,x3)18%
LCM(x2,x5)18% LCM(x2,x7)13%
LCM(x2,x9)15% LCM(x3,x4)17%
LCM(x3,x5)10% LCM(x3,x7)8%
LCM(x3,x8)8% LCM(x3,x10)7%
LCM(x4,x5)7% LCM(x4,x7)8%
LCM(x4,x9)7% LCM(x5,x6)5%
LCM(x5,x7)7% LCM(x5,x8)3%
LCM(x5,x9)3% LCM(x6,x7)5%
LCM(x7,x8)2% LCM(x7,x9)0%
LCM(x7,x10)3% LCM(x8,x9)3%
LCM(x9,x10)0%

LCM advanced. Done: 22%

LCM(x1,x2,x3)23%
LCM(x4,x2,x3)22%
LCM(x1,x2,x4)23%
LCM(x2,x3,x5)5%
LCM(x1,x2,x5)22%
LCM(x1,x2,x6)25%
LCM(x2,x6,x3)23%
LCM(x2,x4,x5)8%
LCM(x1,x3,x4)20%
LCM(x1,x3,x5)17%
LCM(x1,x3,x6)28%
LCM(x3,x4,x5)3%
LCM(x3,x6,x4)20%
LCM(x5,x4,x6)3%

Detail report

The Least Common Multiple - two numbers

Hover the pointer over the grid chart to view the tooltip with the facts description.

123456789101112
LCM(x1,x2)
LCM(x1,x3)
LCM(x1,x4)
LCM(x1,x5)
LCM(x1,x6)
LCM(x1,x7)
LCM(x1,x8)
LCM(x1,x9)
LCM(x1,x10)
LCM(x2,x3)
LCM(x2,x5)
LCM(x2,x7)
LCM(x2,x9)
LCM(x3,x4)
LCM(x3,x5)
LCM(x3,x7)
LCM(x3,x8)
LCM(x3,x10)
LCM(x4,x5)
LCM(x4,x7)
LCM(x4,x9)
LCM(x5,x6)
LCM(x5,x7)
LCM(x5,x8)
LCM(x5,x9)
LCM(x6,x7)
LCM(x7,x8)
LCM(x7,x9)
LCM(x7,x10)
LCM(x8,x9)
LCM(x9,x10)

Perfectly correct answers
Need improvement
Totally incorrect answers
Never practiced

The Least Common Multiple - advanced

Hover the pointer over the grid chart to view the tooltip with the facts description.

123456789101112
LCM(x1,x2,x3)
LCM(x4,x2,x3)
LCM(x1,x2,x4)
LCM(x2,x3,x5)
LCM(x1,x2,x5)
LCM(x1,x2,x6)
LCM(x2,x6,x3)
LCM(x2,x4,x5)
LCM(x1,x3,x4)
LCM(x1,x3,x5)
LCM(x1,x3,x6)
LCM(x3,x4,x5)
LCM(x3,x6,x4)
LCM(x5,x4,x6)

Perfectly correct answers
Need improvement
Totally incorrect answers
Never practiced