Let's start with basic mental math problems. First, we have 32 plus 15. We can break this down by adding the tens: 30 plus 10 equals 40, then add the ones: 2 plus 5 equals 7, so 40 plus 7 equals 47. Next, 48 minus 23. We subtract 20 first: 48 minus 20 equals 28, then subtract 3: 28 minus 3 equals 25.
Now let's work on multiplication and division. First, 60 times 2. We can think of this as 6 times 2 equals 12, then multiply by 10 to get 120. Next, 84 divided by 4. We can split this: 80 divided by 4 equals 20, and 4 divided by 4 equals 1, so 20 plus 1 equals 21.