The last number needed to finish the problem easily is THIS. We need a number when timed by 4 produces 22 but since 22/4 isn’t a whole number, THIS can’t times 4 to make 22.
The answer can’t be 4 as when timed by 4 produces 16 which means that we would need a carried number of 6 from the previous multiplication which is impossible as 4 × 5 = 20 leaving a carried number of 2. The answer can’t be 6 as 6 × 4 = 24 which is larger than 22. So the only option left is 5- see how it works. 5 × 5 = 25 leaving a carrying number of 2; 5 × 4 = 20 but when added with the carried number 2 leaves us with 22- just the number needed.
So now that we have discovered the number, we carry it out like a normal multiplication. So 5 × 2 = 10 leaving 0 with the 1 as a carrying number. 5 × 5 = 25 but when added with the carrying number equals 26 leaving a 6 in the box and a carrying number of 2 which is added to THIS. Since we have all these numbers, we just add them together leaving this.
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