FALL,AUTUMN Mental Math - Number Sense,ADD 10, SUB 10, ADD 100, SUB 100 🍁 Fall / Autumn Mental Math – Number Sense This activity helps students strengthen their number sense by practicing how numbers change when we add or subtract 10 or 100. Add 10: When you add 10 to a number, only the tens digit increases by 1, while the other digits stay the same. 👉 Example: 35 + 10 = 45 Subtract 10: When you subtract 10, only the tens digit decreases by 1. 👉 Example: 72 − 10 = 62 Add 100: When you a