Pattern & rule
67 problems
Read positional rod numerals
Represent numbers by figure rule
Convert ancient symbol numerals
Analogical reasoning with figure pairs
Find missing numbers in a skip-count rule
Broken clock with constant drift
Train timetables and elapsed time
Weekday of a date from the 7-day cycle
Count stones at a given step of a growing pattern
Find numbers placed by an arrangement rule
Find the missing or nth shape in a pattern
Find the rule for a growing figure
Discover the hidden operation rule
Decode the shape-to-number rule
Complete the multiplication table
Units-digit pattern of each times table
Apply a newly defined symbol rule
Lengths in an Arithmetic Progression
Clock chimes and hand cycles
Simplify long sums using regularity
Sum shaded numbers in an array
Shrinking self-similar shapes
Finding equivalent fractions
Find a fraction in a patterned sequence
Old multiplication methods
Finding the hidden rule
Find the rule in a fraction sequence
Sum of a rectangle in a number grid
Sum of consecutive odds and evens
Sum of consecutive numbers by pairing
Find cells from a window-sum rule
Finding the day of the week
Division applications challenge
Sequences and units-digit cycles
Diameter and radius in nested circles
Equivalent fractions from a diagram
Convert between ancient numeral systems
Find the rule, fill the blank
Find a far-off term of a sequence
Sum an evenly spaced sequence
Locate a number in a repeating cycle
Find the rule in stacked equations
Rule for a growing matchstick figure
Rabbit pairs and the Fibonacci sequence
Sierpinski triangle stage counting
Angles swept by the clock hands
Infer and use the cross multiplication method
Simplify products by decomposing factors
Fraction sequences and their tenth terms
Group decimals to simplify a long sum
Simplify a long fraction sum
Pick's theorem from dot counts
Divisibility tests for 2 through 9
Test for 11 by alternating digit sum
Count a growing figure three ways
Find the rule linking two numbers
Iterate a rule to a far term
Evaluate nested defined operations
Find the hidden rule, then place numbers
Sum evenly spaced runs via the middle
Compute with newly defined operations
Angle between the hands at a given time
When the hour and minute hands overlap
Cancel down a long fraction product
Repeated shuffle returns in a cycle
Evaluate a nested defined operation
Split fractions to telescope a sum