Open Access This is an open access article distributed under the CC BY-NC license ( ). These findings showed that the use of Lattice Method enhanced the students' multiplication test score achievement. This technique usually begins with the construction of a lattice (. = 22.481) and the control group (M = 59.29, S.D. Using the lattice method to multiply large numbers, requires just a very little technique. Independent samples t-test results showed that there was a significant difference in mean mathematical achievement between the experimental group (M = 78.52, S.D. Data were analyzed using independent-sample t-test. Students' multiplication test score achievement was measured using post-test at the end of the intervention. The lattice method of multiplication has four steps: Draw the lattice. The experimental group students were taught using Lattice Method while the control group students were taught using the conventional method. The samples were assigned into two groups: Class VI-B containing 27 students, representing the experimental group and Class VI-A containing 28 students, representing the control group. If both numbers that you are multiplying are negative, then the answer will be a positive amount since the negative signs cancel out. If only one of the numbers that you are multiplying is negative, then the answer will be a negative number. This study involved the whole 6th grade students of Gracia Sustain Elementary School in the first semester of the school year 2017/2018. When you arrive at your lattice 'answer' I would then follow the rules around multiplying negative numbers. The research employs a quasi-experimental with non-equivalent pre-test and post-test control group design. This study aimed to identify the effectiveness of Lattice Method on students' multiplication test score achievement. Some students face difficulties in calculating multi-digit multiplication operation, moreover students only familiar with the certain method to solve multiplication operation.
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