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Number sense

Place value, factors and primes, fractions, decimals, percents and ratios

1. 1
   Skill 1Open

   Place value

   Read the value of a digit in a number.

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2. 🔒
   Skill 2Locked

   Factors and multiples

   Find GCF, LCM, and factor counts.

   Master the previous skill to open this one.

3. 🔒
   Skill 3Locked

   Primes and composites

   Tell primes from composites and find prime factors.

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4. 🔒
   Skill 4Locked

   Fractions

   Simplify, write equivalents, and add same-denominator fractions.

   Master the previous skill to open this one.

5. 🔒
   Skill 5Locked

   Decimals

   Place value, decimal addition, and fraction–decimal conversions.

   Master the previous skill to open this one.

6. 🔒
   Skill 6Locked

   Percents and ratios

   Find a percent of a number and reduce a ratio.

   Master the previous skill to open this one.