Page 48 - Start Up Mathematics_4

(a) Borrow 1 ten from the tens place. Since the digit at the tens place is 0,
we cannot borrow.

(b) Shift to borrowing 1 hundred from the hundreds place. But again the
digit at the hundreds place is 0.

(c) Shift to borrowing 1 thousand from the thousands place. Add 1 thousand
or 10 hundreds to the hundreds place.
10 hundreds + 0 hundreds = 10 hundreds

(Now we have 6 at the thousands place).

(d) Borrow 1 hundred or 10 tens from the hundreds place and add to 0 tens.
10 tens + 0 tens = 10 tens

(Now we have 9 at the hundreds place).
(e) Borrow 1 ten or 10 ones from the tens place and add to 2 ones.

10 ones + 2 ones = 12 ones
12 is bigger than 6.

Thus, 12 – 6 = 6.

(Now we have 9 at the tens place.)

Step 2: Subtract the remaining tens. Step 3: Subtract the remaining
9 – 5 = 4 hundreds. 9 – 2 = 7

TTh Th H T O TTh Th H T O
9 9 9 9
8 6 7 10 0 10 0 12 2 8 6 7 10 0 10 0 12 2

– 4 8 2 5 6 – 4 8 2 5 6

4 6 7 4 6

TTh Th H T O

16 9 9 Step 4: Subtract the remaining thousands.
7 8 6 7 10 0 10 0 12 2 But, 6 – 8 is not possible.
– 4 8 2 5 6 Borrow 1 ten thousand or 10 thousands
from the ten thousands place and add
8 7 4 6
it to 6 thousands.
10 thousands + 6 thousands =
16 thousands
16 is bigger than 8.

Thus, 16 – 8 = 8.

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