The Skill Atlas

Number & ArithmeticNUM15 skills

Digits, divisibility, remainders, fractions and the arithmetic shortcuts worth knowing.

• FoundationAssumed by everything above it.

  • ○Not startedNUM-01Place value and digit positions6
  • ○Not startedNUM-03Parity of numbers (odd/even behavior)9
  • ○Not startedNUM-04Divisibility rules: 2, 3, 4, 5, 9, 103
  • ○Not startedNUM-09Fractions of a quantity16
  • ○Not startedNUM-13Number lines and betweenness4

• CoreThe working middle of the exam.

  • ○Not startedNUM-02Digit-constraint puzzles4
  • ○Not startedNUM-05Factors, multiples, LCM and GCD by listing4
  • ○Not startedNUM-06Remainders and modular cycles12
  • ○Not startedNUM-07Last-digit behavior of products and powers6
  • ○Not startedNUM-08Clever regrouping (pair to round numbers)6
  • ○Not startedNUM-10Percentages and simple discounts4
  • ○Not startedNUM-11Ratio as parts of a whole10
  • ○Not startedNUM-12Estimation and order of magnitude2
  • ○Not startedNUM-15Means, and working backwards from a mean4

• GatewayWhat the 5-point questions actually ask for.

  • ○Not startedNUM-14Operation puzzles and cryptarithms2