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Part-part-whole cards are designed to assist students in computation of number sums. This unit of 25 part-part-whole cards will allow students to practice sums from 2 to 10. The unit includes 2 variations for the numbers 2 and 3 and 3 variations for the numbers 4 to 10. With numbers hidden with flaps, Students can then justify what the missing part is and lift the flap to verify their answers. Cards may be used during a number talks, during guided math groups or for individual assessments.