Subtracting - aaamath., An interactive math lesson about subtraction of two-digit numbers.. Second grade numbers operations base ten, Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.. 1.nbt.4 - adding multiple 10 -digit number, In this video, mr. almeida explains how to add a two-digit number and a multiple of 10, using concrete models and strategies based on place value..

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