#61 · Geometry
Hexagon angle
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#63 · Probability
A heart card
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#64 · Combinatorics
Choose 3 from 10
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#66 · Arithmetic
Divisible by all
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#67 · Combinatorics
Trailing zeros of 10!
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#68 · Geometry
Triangle area
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#71 · Probability
At least one head
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#72 · Combinatorics
Anagrams of MAMA
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#73 · Algebra
Quadratic equation II
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#74 · Arithmetic
Sum of odds
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#75 · Geometry
Cylinder volume
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#77 · Probability
Three equal dice
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#78 · Combinatorics
Five-digit, distinct digits
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#80 · Arithmetic
Number of divisors
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#81 · Geometry
Octagon angles
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#84 · Probability
Two girls
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#85 · Combinatorics
Distributing candies
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#86 · Algebra
Sum of roots
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#87 · Arithmetic
Last digit of 7¹⁰⁰
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#88 · Geometry
Inscribed circle
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#90 · Probability
Matching weekdays
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#91 · Geometry
Decagon diagonals
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#92 · Arithmetic
Percentages – discount
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#93 · Arithmetic
Four Friends
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#94 · Arithmetic
Days of the week
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#95 · Logic
Copper cables
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#96 · Fractions
Adding fractions
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#97 · Arithmetic
Percentages
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#98 · Fractions
Multiplying fractions
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#99 · Equations
Linear equation
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#100 · Geometry
Triangle area
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#101 · Logic
Clock in 100 hours
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#102 · Algebra
Sum of squares
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#103 · Functions
Function value
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#104 · Probability
Marbles in a bag
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#105 · Combinatorics
Books on a shelf
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#109 · Geometry
Rectangle from perimeter
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#110 · Logic
Peter and Jana’s ages
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#111 · Arithmetic
Arithmetic mean
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#113 · Probability
Die roll
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#114 · Combinatorics
Two-letter codes
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#115 · Algebra
Difference of squares
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#117 · Algebra
Square equation
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#118 · Geometry
Rhombus area
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#119 · Probability
Sum of 12 on dice
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#120 · Combinatorics
Handshakes of seven people
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#122 · Fractions
Compound fraction expression
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#123 · Equations
System of equations
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