Multiples of Nine.
Here is a website that is worth checking out.
You are asked to pick a 2 digit number and then subtract those 2 digits from your number. ex. you choose 48 and subtract 4 and 8 from it. Your number is 36
You then find your number on a page of numbers and a matching gift.
The computer then tells you the exact gift you chose.
Have the class solve the problem. Have each student choose a number and subtract the two digits. List the numbers.
36, 45, 81, 18, 27
Do you see a pattern?
3+6, 4+5, 8+1
Now take a second look at the gift page. What is listed for 9, 18, 27, 36....?
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