Peter, John and Anna had 60 stamps altogether. Peter had 30 stamps. John had 10 more stamps than Anna. How many stamps did Anna have?
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In QOTW 20, we shared the basic concept of “Comparison of Quantity”, one of the first multi-step heuristic concept introduced in Primary 2. This week, we would like to share a different variation of the “Comparison of Quantity” concept that involves “Part and Whole” concept.