“You will be allowed four minutes in which to complete the 16 series. Begin with the first and complete as many as you possibly can. Ready! Go!” At the end of four minutes after saying “Go” the examiner should call “Stop! Time up! Give me your papers.” All papers should be collected at once. Unusual care will need to be taken in giving this test to avoid variations in the directions used with the different groups examined. In order to maintain absolutely comparable test conditions, no variations from the language and routine given above should be allowed. Write on each blank the number omitted 1 2 3 4 5 .. 7 8 9 10 Series 1. 10 12 .. 16 18 .. 22 24 26 28 Series 2. 12 11 10 .. 8 7 .. .. 4 3 Series 3. 1 3 .. 7 9 11 13 15 17 .. Series 4. .. 39 37 35 33 31 29 .. 25 23 Series 5. 4 5 7 .. 14 19 25 32 40 .. Series 6. 1/64 1/32 1/16 .. ¼ ½ .. 2 .. 8 Series 7. 8 15 .. 29 36 43 .. 57 64 71 Series 8. 10 .. 15 16 20 21 .. 26 30 31 Series 9. 2 .. 8 10 .. 10 20 10 26 .. Series 10. 7 .. 10 11 13 14 .. .. .. 20 Series 11. .. 4 9 16 25 .. .. 64 81 100 Series 12. .. 4 7 14 17 .. .. .. 77 154 Series 13. 32 .. .. .. 28 29 26 27 .. 25 Series 14. 6 10 13 .. .. .. 15 13 10 .. Series 15. 60 55 .. .. 46 45 .. 46 48 .. Series 16. _Directions for Scoring the Test._ The score in this test is the number of series correctly completed regardless of the number of blanks in the series. The maximum score obtainable will therefore be 16 points. The stencil furnished with each set of test leaflets will make it very simple to count the number of series correctly completed. A convenient way of indicating that a series is not correctly completed is to cross out the serial number of that series. To indicate that the series was not attempted one might draw a circle around the serial number of that series. The final score should be entered on the title page of the leaflet in the lower right-hand corner. Scores from 0 to 1 indicate Inferior Ability Scores from 2 to 4 indicate Low Average Ability Scores from 5 to 8 indicate Average Ability Scores from 9 to 11 indicate High Average Ability Scores from 12 to 16 indicate Superior Ability It should be borne in mind that the type of ability measured by the above scores is not necessarily a true indication of the general efficiency of the possessor. MENTIMETER NO. 10 ADDITION TESTS _Character of the Tests._