AS 15 – ADD AND SUBTRACT 10s AND TWO-DIGIT NUMBERS COUNTING BY 10s

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 Three-digit Numbers (Place Value 15) to investigate adding and subtracting tens and two-digit numbers counting by 10s off the decade.
As children are investigating adding and subtracting, they continue to investigate these place value concepts.

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