Comparing Three-Digit Numbers — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each pair of three-digit numbers into Equal or Not equal.
Equal
234 and 234500 and 500789 and 789 Not equal
345 and 354612 and 621406 and 460 Two three-digit numbers are equal only when the hundreds, tens, and ones digits all match. If even one place is different, the numbers are not equal and we use < or >.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 235 and 235 are equal .
Hundreds 2=2, tens 3=3, ones 5=5, so the numbers are equal.
2. 412 and 421 are not equal.
Tens digit differs: 1 in 412 but 2 in 421, so the numbers are not equal.
3. The symbol for equal is =.
The equal sign = shows that two numbers have exactly the same value.
4. 600 = 600 because they are the same number.
Any number is always equal to itself, so 600 = 600 is always true.
5. If 347 and 374 have different tens, they are not equal.
Tens digit differs: 4 versus 7, so the values differ and the numbers are not equal.
Part C: True or False?
Read each statement. Circle True or False.
1. 300 and 300 are equal.
True False
All three digits match, so 300 = 300 is a true equal statement.
2. 456 and 465 are equal.
True False
Tens and ones digits are swapped, so the numbers have different values and are not equal.
3. The = sign means the numbers have the same value.
True False
The equal sign means two expressions have exactly the same value.
4. If one digit is different, the numbers are still equal.
True False
Numbers are equal only when every place value matches; one different digit makes them unequal.