Here is a word problem for grade 1 learners in mathematics with the topic of adding numbers using peso money:

Maria has 5 pesos and her friend Juan has 3 pesos. How much money do they have altogether?

To solve this problem, the students need to add the amounts of money Maria and Juan have. They can do this by counting the number of pesos each person has and then adding them together.

Maria has 5 pesos, so the students can count 1, 2, 3, 4, 5.

Juan has 3 pesos, so the students can count 1, 2, 3.

To find the total amount of money they have, the students can add the number of pesos together: 5 + 3 = 8.

Therefore, Maria and Juan have a total of 8 pesos altogether.