I am an odd number. Remove one letter and I become even. What number am I - Seven (remove “s” → even), I have keys but open no locks. I have space but no room. What am I? - A keyboard (has number keys 0–9), What number becomes bigger when you turn it upside down? - 6 (becomes 9), I am thinking of a number. Double me and add 8 to get 28. What number am I? - 10, I am a shape with no corners, no edges, and the same distance from centre to edge everywhere. What shape am I? - A circle, Which number is the same upside down on a calculator? - 88, I go up but never come down. People measure me every year. What am I? - age, What occurs once in a minute, twice in a moment, but never in a thousand years? - letter m, I am a number. Double me and add 10, you get 50. What am I? - 20, You have a pizza cut into 8 slices. You eat 3/8 of it. How many slices are left? - 5, I have keys but no locks. I have space but no room. You can enter, but can’t go outside. What am I? - keyboard, I am thinking of two numbers. Their sum is 10 and their product is 21. What are the numbers? - 3 and 7, Which weighs more: a kilogram of gold or a kilogram of feathers? - They weigh the same — 1 kg, I am thinking of a number. Subtract me from 20 and the answer is 12. What number am I? - 8, What 3-digit number is the same forwards and backwards, and the sum of its digits is 15? - 555, 3. I am a number. Add me to myself, multiply by 2, and subtract 4 — you get 20. What number am I? - 6, What has numbers but no life, hands but no fingers, ticks but no noise? - clock, 10. If two’s company and three’s a crowd, what are four and five? - 4 + 5 =9, How many months have 28 days? - all months, If I take half of myself and add 5, I become 15. What number am I? - 20, What is full of holes but can still hold water? - sponge, I am a shape with three sides and three angles. What am I? - triangle, How many times can you subtract 5 from 25? - Once — after that, it’s no longer 25, I am a number that reads the same upside down. I am less than 100. Who am I? - 69, 88, 96, I am thinking of two numbers. One is double the other. Their sum is 18. What are the numbers? - 6 and 12, I am a number. Multiply me by myself, subtract me, and the result is 0. What number am I? - 0 or 1, I am always coming but never arrives. What am I? - tomorrow, Two fathers and two sons walk into a room, but there are only three people. How is this possible? - Grandfather, father, and son, I am a number. When you multiply me by any number, the answer is the same as adding me to itself that many times. What number am I? - any number, What is greater than God, more evil than the devil, rich people need it, poor people have it, and if you eat it you die? - nothing,

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