AS 17 – ADD AND SUBTRACT TWO-DIGIT NUMBERS USING PLACE VALUE

Children use their developing understanding of counting forwards and backwards by 10s off the decade, explaining which digit changes and why (Place Value 12, Patterns and Algebra 11), partitioning 10s numbers (Place Value 13), friends of 100 (Place Value 14) and standard and non-standard place value of and partitioning three-digit Numbers (Place Value 15) to investigate adding and subtracting two-digit numbers using place value and compensation.
As children are investigating adding and subtracting, they continue to investigate these place value concepts.

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