50 + 20 = 70 - 5 tens + 2 tens = 7 tens , 90 - 40 = 50 - 9 tens - 4 tens = 5 tens, 20 + 20 = 40 - 2 tens + 2 tens = 4 tens, 60 - 10 = 50 - 6 tens - 1 ten = 5 tens, 80 + 10 = 90 - 8 tens + 1 ten = 9 tens, 40 - 30 = 10 - 4 tens + 3 tens = 1 ten, 30 + 50 = 80 - 3 tens + 5 tens = 8 tens, 10 - 10 = 0 - 1 ten - 1 ten = 0 tens, 70 - 60 = 10 - 7 tens - 6 tens = 1 ten, 90 - 70 = 20 - 9 tens -7 tens = 2 tens, 10 + 60 = 70 - 1 ten + 6 tens = 7 tens, 90 - 50= 40 - 9 tens - 5 tens = 4 tens, 30 + 0 = 30 - 3 tens + 0 tens = 3 tens, 80 - 20 = 60 - 8 tens - 2 tens = 6 tens, 50 + 40 = 90 - 5 tens + 4 tens = 9 tens, 20 - 20 = 0 - 2 tens - 2 tens = 0 tens , 20 + 0 = 20 - 2 tens + 0 tens = 2 tens , 50 - 30 = 20 - 5 tens - 3 tens = 2 tens , 70 + 30 = 100 - 7 tens + 3 tens = 10 tens,

Adding and Subtracting Tens

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