chapter 13 forms the foundation for decimals and fractions and eventually percents. Students need to master this aspect of number theory in order to simplify fractions,, add, subtract, multiply, and divide fractions.
Your child has been learning to develop and apply number theory rules in real world and mathematical problem situations. Knowing the rules of divisibility can help your child determine quickly if one number is divisible by another number. Your child should know the divisibility rules for 2, 3, 4, 5, 6, 9, and 10.
Multiples of one number that are also multiples of another number are called common multiples. The least common multiple (LCM) is the least number that is a common multiple. The greatest common factor (GCF) is the greatest number that divides evenly with no remainder into two or more numbers.
Have a confident knowledge of multiplication facts through 12 will assist your child in finding factors and multiples of numbers.
Students often switch GCF and LCM. Make sure they do not mix up the two.
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