Rocket Math Addition Set D: A one-minute test worksheet for practicing addition facts with a space-themed design.

Let’s solve the problems in the red box at the top left of the page. These are simple addition problems with 1 added to different numbers.

We’ll go one by one:

First problem:
1 + 7
Start at 1, count up 7 more: 2, 3, 4, 5, 6, 7, 8 → Answer is 8

Second problem:
7 + 1
Start at 7, add 1 → just go to the next number: 8

Third problem:
1 + 8
Start at 1, count up 8: 2, 3, 4, 5, 6, 7, 8, 9 → Answer is 9

Fourth problem:
8 + 1
Start at 8, add 1 → next number is 9

So the answers for the four boxes in order are:
8, 8, 9, 9

Final Answer:
8, 8, 9, 9