20
Because their system is based on adding numbers ob so a zero is not nessaCary it is like instead of 5+10+20+5+60=100 you write 5+0+10+0+20+0+5+0+60=100
Adding a positive and negative number, the sum will always be negative. Example: 10+-20=-10 If you add two negatives, they cancel each other out making it positive.
21.2
you keep adding 5 for example: 5 10 15 20 25 30 35 40....
Before adding the fractions together, it is best to get like-denominators:3/10 + 1/20or6/20 + 1/20 = 7/20
what number is next in the sequence: 10,20,30,20,(? 30
Oh, what a lovely pattern you've created! It looks like you're adding 10, then subtracting 10, then adding 120, then subtracting 10 again. Keep exploring those patterns and see where they take you on your creative journey!
20
When you start skip counting it is just adding the same number over and over again..like 5+5=10+5+15+5+20....
0 - 20 equals -20. Like a debt that can only be cleared by adding 20
Because their system is based on adding numbers ob so a zero is not nessaCary it is like instead of 5+10+20+5+60=100 you write 5+0+10+0+20+0+5+0+60=100
Well, isn't that just a happy little math problem! To find 50% of 20, you simply divide 20 by 2, which gives you 10. Then, you add that 10 back to the original 20, giving you a total of 30. So, 20 increased by 50% is 30.
The prime number less than 10 that, when added to either 10 or 20, results in a prime number is 3. When you add 10 to 3, you get 13, which is a prime number. Similarly, when you add 20 to 3, you get 23, which is also a prime number.
Adding a positive and negative number, the sum will always be negative. Example: 10+-20=-10 If you add two negatives, they cancel each other out making it positive.
10, 20, 30, 40, 50, 60, and so on 10, 20, 30, 40, 50 The first ten multiples of ten are 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100. 10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160,170,180,190.........................……and keep on adding 10.
-15 - (-10)= -5. Subtracting a negative is just like adding a positive.