Answer: 16 + 35 + 24 + 14 = 89
Strategy #1 : You could break them up.
.... 10+30+20+10=70
.... 6+5+4+4=19
....70+19=89
Or, you can separate them into groups!
16+35=51
24+14=38
51+38=89
Hope this helps you out! If you need anymore help with math, let me know and I will be more than happy to help you out! ☺
-Karleif Jonsi-