Add and Subtract Multiples of Ten (to 100) . Adding and subtracting multiples of ten involves students combining knowledge of the addition and subtraction operations with their understanding of place value. Students need to see the connection between multiples of ten and the number OF tens in the number. . Ten-frames are a wonderful resource to achieve this connection. By representing multiples of ten using ten-frames students see the total quantity but also see the number of tens. Adding and su