mediumlogic

Illustration for riddle: With the numbers 123456789, make them add up to 100. They must stay in the same order. You can use a — Can you figure out this riddle?

With the numbers 123456789, make them add up to 100. They must stay in the same order. You can use addition, subtraction, multiplication, and division. Remember, they have to stay in the same order.

1+2+3+4+5+6+7+(8x9)=100

Why this works

This riddle plays with both mathematical operations and the sequence of digits. You need to use the digits 1 through 9 in order while strategically placing mathematical signs to reach a total of 100. The key lies in recognizing that the multiplication of 8 and 9 (which equals 72) provides a significant boost to the sum, allowing the earlier digits (1 through 7) to add up to 28. When you add 28 and 72, you achieve the target of 100, demonstrating how combining operations can lead to the desired outcome while adhering to the riddle's constraints.

Common Wrong Answers

“1+2+3+4+5+6+78+9”

This guess adds the digits incorrectly by treating '78' as a single number, which disrupts the sequence and does not utilize all numbers in the required order.

“1+2+3+4+5+6+(7x8)+9”

This guess uses multiplication incorrectly by adding '9' after multiplying '7' and '8', which results in a sum that exceeds 100.

“12+34+5+6+7+8+9”

This guess combines digits in a way that creates larger numbers, violating the rule of keeping the digits in their original order without altering them.

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