Powers mod n, last digits Quiz
10 questions · easy to harder · Discrete Math · score and step-by-step answers
How it works
- 10 questions, about 30 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 5 questions have choices. For the others you type the answer: a number like 4, −2, 7/2 or 3.5, or for example x = 4, x = 2 or x = −3, (3, 5), 2x + 1. Use ^ for powers (x^2) and sqrt for √. Any form with the same value counts (7/2 = 3.5).
- One question at a time: Back, Next, Mark for review and the question list at the bottom. A calculator is on the screen.
- At the end: your percent and grade, every question right or wrong, why a wrong choice is wrong, and its step-by-step solution. Then practise the lesson with new questions.
Your answers and results are kept in this browser only, so you can close the page and come back.
1 Question 1
Calculate 3100 mod 5- A) 9
- B) 1
- C) 4
- D) 3
2 Question 2
Last digit of 7100Type the answer.
3 Question 3
Calculate 430 mod 5- A) 1
- B) 4
- C) 16
4 Question 4
Calculate 345 mod 7Type the answer.
5 Question 5
Last digit of 977- A) 9
- B) 81
- C) 1
6 Question 6
Remainder when 2100 is divided by 5Type the answer.
7 Question 7
Calculate 235 mod 9- A) 8
- B) 2
- C) 5
- D) 4
8 Question 8
Calculate 3200 mod 13Type the answer.
9 Question 9
Remainder when 41000 is divided by 7- A) 2
- B) 4
- C) 8
- D) 16
10 Question 10
Last digit of 4777Type the answer.