100th Day Number Challenge Bell Ringer
A five-minute math celebration for day 100: write 100 as sums, products, and differences in as many ways as you can. How flexible is your number sense?
- Best time
- January, February
- Format
- Timed warm-ups students start the moment class begins
- Cost
- Free — no student accounts
Sign up free (under a minute), pick your plan, and you'll land right inside your own editable copy.
- 1 Copy it to your account
- 2 Tweak anything (or nothing)
- 3 Share your link with students
Try it right here
This is exactly what you and your students see. Click through it, answer, vote. When you're sold, copy it to make it yours.
100th Day Number Challenge Bell Ringer
A five-minute math celebration for day 100: write 100 as sums, products, and differences in as many ways as you can. How flexible is your number sense?
What's inside this bell ringer
100th Day Number Challenge! Write the number 100 as: (1) the sum of two odd numbers, (2) a product of two numbers — three different ways, (3) a difference of two numbers where both are bigger than 500, (4) a sum of exactly five numbers. How many can you finish before the timer?
Teacher tips
Collect the most creative answers on the board — someone always finds 4 × 25 and someone always finds 1,000 − 900.
Frequently asked questions
How do I use this activity with my class?
Every teacher runs their own copy. Click "Copy & make it yours" and this template is added to your free DailyEd account — you can edit every question, prompt, and setting, then share YOUR link with students. Their responses go only to you.
Is this activity free?
Yes. This template and everything in the DailyEd activity library is free for teachers.
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