The developed Strategic Intervention Materials (SIM) for Numbers and Number Sense are designed to simplify concepts in Grade 7 Mathematics through varied activities that will enable the students to gain better understanding of the concepts especially those whose numeracy skills level needs major support as revealed by the results of the numeracy assessment conducted during its implementation to the Grade 7 students of Malabog National High School. Numbers and Number Sense is a strand which includes concepts of numbers, properties, operations, estimation, and their applications. The concept along this strand is being discussed in the first quarter of a school year and for Grade 7. It includes sets, integers, rational numbers, irrational numbers, and real numbers. The researcher developed strategic intervention materials for Grade 7 Mathematics along Numbers and Number Sense. The developed SIM was subjected to jurors’ evaluation in terms of its Instructional Design and Organization, Language, Content and Format before it was tried out to 15 randomly selected Grade 7 students from different sections who were not respondents of this study and to five teachers handling Grade 7 subjects at Malabog National High School. An evaluation form was provided to the jurors to determine if the indicators for Instructional Design and Organization, Language, Content and Format were evident in the developed SIM. The guidelines and processes for LRMDS assessment and evaluation in the form of a rating sheet for print resources were also used by the jurors in evaluating the SIM. The final copy of the SIM was prepared, incorporating the suggestions of the jurors and the teachers. The Strategic Intervention Materials were then distributed to the fifteen (15) identified Grade 7 students enrolled at Malabog National High School for School Year 2020-2021 who were given permission by their parents to participate in the study. After using the materials, the respondents were again given the numeracy assessment for Grade 7 Mathematics. The answers were encoded in the eNumerALS template to generate the report cards of the respondents. The results were analyzed and were compared to those of the results during the implementation of the numeracy assessment prior to the use of the SIM. Only the results for Numbers and Number Sense were considered in this study. A questionnaire was used to determine the students’ and teachers’ level of acceptability on the developed SIM. The responses of the students and teachers revealed that the developed strategic intervention materials are very acceptable, as they suit the level of the learners and that they can be one of the effective and functional instructional materials to use when simplifying the teaching-learning process on abstract and difficult concepts. The students were also provided with guide questions as they were asked to write their journals about their experiences, and insights as they work on the developed SIM. To find out if there is significant difference between the numeracy skills level of the students before and after the use of the SIM, their scores were subjected to t-test. The results revealed that there is a significant difference between the numeracy skills level of the students after the utilization of the SIM. Based on the results, it was concluded that the developed SIM was very acceptable for the use of the students and teachers and that the use of the SIM for Grade 7 Mathematics along Numbers and Numbers Sense helped the students to enhance their numeracy skills in the said strand. It is also an effective and functional material to use when students need major support, particularly on understanding abstract and difficult concepts. The results of the task analysis imply that the Strategic Intervention Materials were of help to the students in enhancing their numeracy skills.