Count by twos, threes, fives and tens quiz online. This is an interactive activity for children to review their numbers skills. Counting in twos entails adding clusters of twos in each case as opposed to counting one by one. The same applies to counting in clusters of fives. This quiz contains pictures of objects showing groups of twos, fives and tens. After counting groups of objects, select the correct answer and submit. You’re your skills a home or in school by taking this test. 1st , 2nd and 3rd grades math skill.