1 ten and 11 ones is 1 × 10 + 11 × 1 = 10 + 11 = 21.
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when you add a number from 3 to 9
Okay, what this means is to simplify the number 94 to the nearest ten. The 9 is in the tens place, and the 4 is in the ones place. So if you want to round to the nearest ten, you look at the number in the ones place; if the number in the ones place is any number from 1 to 4 then it gets rounded to zero. But if the number in the ones place is any number from 5 to 9, it is rounded up. So, if you look at 94, the four is in the ones place thus rounding 94 down to 90.
438
Having: 9 ten-thousands → 90,000 the same number of thousands as ten thousands → 9 ten-thousands: 9 thousands → 9,000 8 fewer hundreds than ten-thousands → 9 ten-thousand: 9 - 8 = 1 hundreds → 100 6 more tens than hundreds → 1 hundreds: 1 + 6 = 7 tens → 70 6 fewer ones than thousands → 9 thousands: 9 - 6 = 3 ones → 3 → the number is 90,000 + 9,000 + 100 + 70 + 3 = 99,173.
7*100 = 700 14*10 = 140 11*1 = 11 Sum = 851