Add. Show partial sums. Look for the pattern write last addition problem in the pattern

1) 318+235

320+335

322+435

Partial sums (top to bottom) : 553, 655, 757

Last addition problem: 324+535=859

Step-by-step explanation:

The pattern is that we are adding 102 each time. For example:

335-235=100

320-318=2

100+2=102

So the next addition problem would be 324+535 which equals 859.