Adding Bigger Numbers Adding numbers with four digits is very similar to adding numbers with three digits. 1.


a) Th H T U 4 7 5 3


+ 2 1 4 6


b) Th H T U 6 4 2 1


+ 1 5 7 8


2. Complete the following in your copy. a) 1824 + 3155


c) Th H T U 8 3 6 2


+ 1 6 3 5


d) Th H T U 1 8 7 3


+ 7 1 2 5


e) Th H T U 2 7 2 4


+ 6 2 7 5


b) 2051 + 5427 Adding Bigger Numbers (with Regrouping)


On Friday night, 3894 people attended a concert; 4678 people attended the same concert on Saturday night. How many people attended altogether?


Step 1: Add the units column: 4 + 8 = 12. Regroup every 10 units to make 1 ten. So 12 makes 1 ten and 2 units. Write the 2 in the units column. Bring the 1 (10 units) to the tens column


Step 2: Add the tens column 9 (9 tens) + 7 (7 tens) + 1 (1 tens) = 17. Regroup every 10 tens to make 1 hundred. So 17 makes 1 hundred and 7 tens. Write the 7 in the tens column. Bring the 1 (1 hundred) to the hundreds column.


Step 3: Add the hundreds column. 8 (8 hundreds) + 2 (2 hundreds) + 1 (1 hundred) Regroup every 10 tens to make 1 thousand. So 11 makes 1 thousand and 1 hundred. Write the 1 in the hundreds column. Bring the 1 (1 thousand) to the thousands column.


Step 4: Add the thousands column.


3 (3 thousands) + 4 (4 thousands) + 1 (1 thousand) Write 8 in the thousands column. Answer: 8172 people attended the concert altogether.


+ 4 2 7 8 2


Th H T U 3 8 9 4 1


c) 9024 + 375


+ 4 2 7 8 7 2


Th H T U 3 8 9 4 11


+ 4 2 7 8 1 7 2


1


Th H T U 3 8 9 4 11


+ 4 2 7 8 8 1 7 2


1


Th H T U 3 8 9 4 11


Addition


17


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