This hard worksheet pushes first graders past simple tens-and-ones identification into reasoning with expanded form and missing addends. Part A's multiple choice asks which number has 9 tens and 0 ones (90), what 50 + 3 looks like as a number (53), which digit is in the tens place of 68, and how 41 looks in expanded form (40 + 1). Part B's fill-in-the-blanks include 'If you take away 1 ten from 52, you get ___', 'The value of the 7 in 73 is ___', and the missing-addend prompt '___ + 4 = 64.' The closing question, 'A number with 0 tens and 8 ones is ___', is a good check that students still see one-digit numbers as place value problems too.