9+ 8 =
2x 17
29 + 33 =
9 x 8 = 72
164 ÷ 2 =
half of 20 =
6 x 3 =
39 - 20 =
54 + 37 =

9+8=17 | 2×17=34 | 29+33=62 | 164÷2=82| 20÷2=10 | 6×3=18 | 39-20=19 | 54+37= 91|

Step-by-step explanation:

9+8 is 17 since 9+9 is 18 so you just remove a number to make it 17 which is the same thing that happened to the nine that turned into an 8.

17×2 is 34 b/c 17+17 is 34. details to follow.

50 in 1.5 hours.

Step-by-step explanation:

If Joan can do 50 in 3 hours, then in 1 hour, that’s 50/3.  

Jill completes the rest of the 50, so 50-(50/3) is how many letters Jill can type in an hour.  

50-(50/3)=(150/3)-(50/3)=100/3 letters in an hour. If Jill can write 100 letters in 3 hours, then she can write 50 in 1.5 hours.