This study aimed to investigate the effectiveness of blended learning using Google classroom application on grade fours student’s achievement in mathematics and their attitudes toward it. The study sample consisted of 61 students of the fourth-grade students at Manhal International School in 2018\2019 academic year. The sample was divided into two study groups, a group of blended learning consisting of 31 students and a conventional group consisting of 30 students. The quasi-experimental analysis method was used to achieve the objectives of the study. Two tools were used in the study: Academic achievement test in probability and statistics, and questionnaire of attitudes towards mathematics. The study results showed that there were statistically significant differences in academic achievement and attitudes toward mathematics in favour of blended learning group, and there was a significant positive correlation between academic achievement and attitudes towards mathematic.