Page 36 - Start Up Mathematics_3
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Th H T O Th H T O Th H T O
(g) (h) (i)
1 4 3 2 2 0 0 6 3 5 4 2
+ 5 0 2 6 + 8 5 2 + 6 2 1 3
2. Add the following numbers.
(a) 6214 + 2073 (b) 7876 + 2012 (c) 3461 + 2228 (d) 6291 + 6507
Addition of Two 4-Digit Numbers Quick Tip
(with carry over)
This method is also
Example 2: Add 8254 and 7918. called “Addition by
regrouping.”
Solution: Th H T O
8 2 5 4 Step 1: Add the ones.
+ 7 9 1 8 4 + 8 = 12
1 2
Th H T O
8 2 1 5 4 Step 2: 12 is a 2-digit number. Write 2 in the
ones place and carry over 1 to the
+ 7 9 1 8
tens place. Add the tens including
7 2 the 1 carried over.
1 + 5 + 1 = 7
Th H T O
8 2 1 5 4 Step 3: Add the hundreds (there is no carry
+ 7 9 1 8 over).
1 1 7 2 2 + 9 = 11
TTh Th H T O
1 8 2 1 5 4 Step 4: 11 is a 2-digit number. Write 1 in
the hundreds place and carry over
+ 7 9 1 8 1 to the thousands place. Add the
1 6 1 7 2 thousands including the 1 carried
over.
1 + 8 + 7 = 16
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