A number of informal names were used during this series. Each possible combination of large and small numbers in the Numbers Round had its own informal name:
- A "Rat Pack" is six small numbers.
- A "Classroom Mix" is one large number and five small numbers.
- A "Family Mix" is two large numbers and four small numbers.
- An "Even Stevens", also referred to as a "Perfect Match", is three large and three small numbers.
- A "Heavyweight" is all four large numbers and two small numbers.
The following informal names were also used:
- A "Full Monty" is when all nine letters are used by a contestant in a Letters Round.
- A "Kitchen Sink" is when all six numbers are used by a contestant in a Numbers Round.
- A "Scenic Route" is a complicated way of getting near the target number where a simpler option is available.
- "Tweaking" is the act of adding or subtracting a small number to or from a large number before it is multiplied in order to get closer to the target number than multiplying the large number alone. For example, if the large numbers include 100, the small numbers include 2, 3 and 6 and the target to reach is 580, many people would think of multiplying 100 by 6 and then subtracting the other small numbers to get close to the target, but the 100 can be "tweaked" by subtracting 3 from it first, then the resulting 97 is multiplied by 6 to get 582, and after subtracting 2, you will reach the exact target.