20
15
The fraction halfway between 2/5 and 9/10 is 13/20
-5 It is 15 more than -20 and 15 less than 10 To find a halfway point (which is also the average), add the numbers together and divide by 2. -20 + 10 = -10 and -10/2 = -5
310 and 410: 360 3/10 and 4/10: 7/20
-5
20
5 It is 15 more than -10 and 15 less than +20. To find the halfway point (the average), add the two numbers and divide by 2. -10 + 20 = 10 divided by 2 = 5
15
It is: 15
-5
The fraction halfway between 2/5 and 9/10 is 13/20
30
-5 It is 15 more than -20 and 15 less than 10 To find a halfway point (which is also the average), add the numbers together and divide by 2. -20 + 10 = -10 and -10/2 = -5
0.3 is halfway between 20% and 40%
310 and 410: 360 3/10 and 4/10: 7/20
same trick as always add the two together and divide by 2 (adding a negative is the same as taking away) so (20-15)/2 or 2.5