Question

Chapter Check-Up
Simplify the following.
2 85 - 20 = 4 + 10 of 2
1 6 of 20 - 5 - 10
4 45+ (35 – 12) – 5
3 37 +26+ 2 + 2 of 25 -- 80 - 2
6 80 - {20 – (5 + 2 - 4 = 2)}
5 20 + (2 of 3 + 8 - 4) + 7
8 8 - {3 – 2 + (6 - 4 + 1)}
7 90 + (10 + 15 of 3 - (20 + 30 – 45 = 5)}
9 What are the multiples of 5 between 20 and 50?
10 Write all the factors of 72.
11 Is 28 a perfect number? Explain. Give one more example of a perfect number.
12 List the twin primes between 1 and 50.
13 Which of the following sets of numbers are co-prime numbers?
a 441 and 288
b 91 and 27
c 2310 and 2431
14 Separate the odd and even numbers from the following.​

Answer 1

Answer:

I don't know the answer...............288282