Comparing Three-Digit Numbers — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 300 + 40 + 5 written as a standard number is 345 .
Expanded form 300 + 40 + 5 combines the hundreds, tens, and ones to give the standard numeral 345.
2. The word form 'four hundred twelve' is 412 as a numeral.
Four hundred twelve means 4 hundreds, 1 ten, and 2 ones, which writes as 412 in standard form.
3. 6 hundreds, 0 tens, 7 ones equals 607 .
With 6 hundreds, no tens, and 7 ones, the numeral is 607 because the zero holds the tens place.
4. 500 + 30 compared to 530 shows they are equal .
500 + 30 simplifies to 530, and 530 equals 530, so the two representations have the same value.
5. Is 'two hundred ninety' greater or less than 300? less .
Two hundred ninety equals 290, which has fewer hundreds than 300, so 290 is less than 300.
6. 700 + 60 + 8 compared to 768 is equal .
Expanded form 700 + 60 + 8 adds to 768, so the expanded and standard forms are exactly equal.
7. 4 hundreds and 9 ones written as a number is 409 .
With 4 hundreds, 0 tens, and 9 ones, the numeral is 409 because there are no tens.
8. The standard form of 'five hundred fifty' is 550 .
Five hundred fifty means 5 hundreds, 5 tens, and 0 ones, which writes as 550.
9. 200 + 80 + 1 equals 281 .
Combining 200 hundreds, 80 tens, and 1 one gives the standard numeral 281.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
400 + 50 + 6
→ 456
456
six hundred thirty
→ 630
630
2 hundreds 1 ten 9 ones
→ 219
219
seven hundred four
→ 704
704
Expanded form, word form, and place-value descriptions all name the same number in different ways, so converting to the standard numeral reveals the match.