This study focused on the impact of Mentimeter application in the performance of grade 3 learners in Mathematics.

The study utilized the pre-test-post-test design and the t-test to determine whether there is any significant difference between the performance of the learners before and after the conduct of activities using Mentimeter in Mathematics 3 lessons. On the other hand, the respondents were chosen using purposive sampling technique.

The result showed that during the pre-test, the respondents got a mean score of 4.65 and 23.25% as percentage of mastery. Based on the result, the respondents got below average of mastery of the lessons before the administration of Mentimeter in Mathematics 3 activities. l Posttest was administered to know the performance of the respondents. Based on the result of the Post Test, the mean score of the respondents is 13.4 with a percentage of mastery of 67%. To compare the result of the pre-test and posttest, t-test was administered. The computed t-value of 8.340 is greater that the critical value with 1.686 at 0.05 level of significance, with 38 degrees of freedom. Thus, the null hypothesis is rejected. This means that there is very high significant difference between the performance of the learners before and after the conduct of activities using Mentimeter in Mathematics 3 lessons.

From the results drawn from this study, educational online applications like Mentimeter helped learning enjoyable and engaging specially in this time of pandemic

Keywords: Performance, online application, Mentimeter, new normal