Math Grade 1 Quiz place value, properties of operations, and/or the relationship between addition and subtraction in the range 10-90-1.NBT.C.6

This standard emphasises the ability of students to subtract multiples of 10 from one another within the range of 10-90. It builds on the understanding of place value and how, when subtracting tens, only the tens place of the numbers change. Students use various tools such as concrete models, drawings, and strategic reasoning rooted in place value and the inherent properties of arithmetic operations. This foundational knowledge supports more complex arithmetic in later grades. Furthermore, students are encouraged to link their hands-on strategies to written methods, ensuring a deep and comprehensive understanding of the concept.