The aim of this study was to examine the effect of using computers during mathematics lessons on the academic achievements of 4th-grade students. Additionally, this study aimed to determine the frequency of computer usage in selected countries. TIMSS 2019 4th-grade mathematics data were used in this study to determine the relationship between student mathematics achievement and the use of activities on computers during mathematics lessons, to support student learning by teachers in different countries. To identify the relationship between student mathematics achievement and the use of computers while teaching mathematics, a linear regression analysis was conducted. The results showed that the use of computers explained the high student achievements for the countries that ranked above average and the low student achievements for the countries that ranked below average. On the other hand, the relationship between computer usage in 4th-grade math education and test scores is likely to vary between the selected countries.