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20 times. (8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 98)<\/p>\n
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The multiplication<\/h3>\n\n\n\n If you multiply this number by any other number, the answer will always be the same. What number is this?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
Zero<\/p>\n
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Subtraction<\/h3>\n\n\n\n How many times can you subtract the number 5 from 25?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
Only once because after you subtract it is not going to be 25 anymore.<\/p>\n
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The reverse age<\/h3>\n\n\n\n The ages of a father and son add up to 66. The father\u2019s age is the son\u2019s age reversed. How old could they be?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
There are three possible solutions for this, the father-son duo could be 51 and 15 years old, 42 and 24 years old or 60 and 06 years old.<\/p>\n
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More socks<\/h3>\n\n\n\n There are 6 black socks, 8 brown socks, 4 blue socks, and 2 red socks in my sock drawer. Can you figure out the minimum number of socks to be pulled out to get a matching pair for sure?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
At least 5<\/p>\n
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The coin toss<\/h3>\n\n\n\n Robin tosses a coin 10 times, and it lands in the heads-up position all ten times. So what are the possible chances for him to toss it up again and get landed in a heads-up position?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
He has a 50% chance to see the heads up position. This is because the coin toss is not dependent on the first 10 tosses.<\/p>\n
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How much does a cat cost?<\/h3>\n\n\n\n The price of a duck is $9, a spider costs $36, and a bee is priced at $27.
ANSWER<\/button><\/p>\n
$18 ($4.50 per leg)<\/p>\n
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The handshake<\/h3>\n\n\n\n Seven boys met each other at a party. Each of them shakes hands only once with each of the other boys. What is the total number of handshakes that took place?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
Twenty-one<\/p>\n
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Hard Math Riddles for Kids<\/h2>\n\n\n\nThe house number<\/h3>\n\n\n\n My friend lives at the reverse of my house number. The difference between our house numbers ends in two. What are the lowest possible numbers of our house?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
The lowest possible numbers for our house are 19 and 91.<\/p>\n
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Mrs Jones and her apple tree<\/h3>\n\n\n\n Mrs. Jones was very proud of her apple tree. One autumn, after harvesting her apples, she called her three sons together. \u201cHere are 150 apples,\u201d she said. \u201cI want you to take them to the market tomorrow and sell them for me.\u201d She gave Paul 15 apples, Nick 50, and Ben 85. \u201cYour job,\u201d added Mrs. Jones, \u201cis to sell the apples in such a way that each of you brings home the same amount of money.\u201d How do they do it?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
The first buyer purchases 12 dozen apples at $1 per dozen. Paul sells him one dozen and has three apples left; Nick sells him four-dozen and has two apples left; and Ben sells him seven-dozen and has one apple left. Then a second buyer comes along and buys all their remaining apples for $3 apiece. The three brothers head home with $10 each.<\/p>\n
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Brothers talk<\/h3>\n\n\n\n One brother says of his younger brother: \u201cTwo years ago, I was three times as old as my brother was. In three years, I will be twice as old as my brother.\u201d How old are they each now?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
The elder is 17, the younger 7. Two years ago, they were 15 and 5 respectively, and in three years\u2019 time, they will be 20 and 10.<\/p>\n
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The turtles at the aquarium<\/h3>\n\n\n\n Leon works at the aquarium. When he tries to put each turtle in its own tank, he has one turtle too many. But if he puts two turtles per tank, he has one tank too many. How many turtles and how many tanks does Leon have?<\/p>\n\n\n
ANSWER<\/button><\/p>\n
He have 3 tanks and 4 turtles.<\/p>\n
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The speed of the train<\/h3>\n\n\n\n A 300 ft. train is traveling 300 ft. per minute must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?<\/p>\n\n\n
ANSWER<\/button>