Unit 1: Number Sense
Topic B: Place Value
As you know, we count much higher than ten in our world. Each place in a number has a value.
The ones place tells how many ones there are.
- 3 means 3 ones.
- 0 means 0 ones
- 9 means 9 ones
9 is the largest amount that we can express (write or say) with one digit.
The tens place shows how many tens there are. The ones place must have a digit in it before there can be a digit in the tens place.
Every ten is ten ones.
43 means 4 tens and 3 ones.
20 means 2 tens and 0 ones. The zero holds the ones place.
99 means 9 tens and 9 ones. 99 is the largest amount that we can express (write or say) using only two digits.
Exercise 1
Fill in the blanks to make each sentence true. Draw a picture for questions c, f, h, and j like the examples. Check your work using the answer key at the end of the exercise. Ask your instructor to check your sketches.
Example
49 means 4 tens and 9 ones.
- 37 means tens and ones.
- 65 means tens and ones.
- 56 means tens and ones.
- 87 means tens and ones
- 33 means tens and ones.
- 60 means tens and ones.
Answers to Exercise 1
- 3 tens, 7 ones
- 6 tens, 5 ones
- 5 tens, 6 ones
- 8 tens, 7 ones
- 3 tens, 3 ones
- 6 tens, 0 ones
The place to the left of the tens place is the hundreds place. It shows how many hundreds there are. A number written using three whole digits has a hundreds place, a tens place, and a ones place.
Every hundred is the same as ten tens, and every hundred is the same as one hundred ones.
Every hundred is ten tens – every hundred is the same as one hundred ones.
100 100 100
425 means 4 hundreds, 2 tens, and 5 ones
354 means 3 hundreds, 5 tens, and 4 ones
Exercise 2
Fill in the blanks to make each sentence true. Draw a picture for questions b, c, d, and e, like the examples. Check your work using the answer key at the end of the exercise. Ask your instructor to check your sketches.
- 190 = 1 hundreds, 9 tens, 0 ones.
- 555 = hundreds, tens, ones.
- 309 = hundreds, tens, ones.
- 499 = hundreds, tens, ones.
- 480 = hundreds, tens, ones.
Answers to Exercise 2
- 5 hundreds, 5 tines, 5 ones
- 3 hundreds, 0 tens, 9 ones
- 4 hundreds, 9 tens, 9 ones
- 4 hundreds, 8 tens, 0 ones
Exercise 3
Count the hundreds, tens, and ones shown in the drawings. The pictures will help you understand the quantity of a number. Then write the numeral. The first one is done for you. Check your work using the answer key at the end of the exercise.
- 2 hundreds, 0 tens, 3 ones = 203
- hundreds, tens, ones =
- hundreds, tens, ones =
- hundreds, tens, ones =
Answers to Exercise 3
- 4 hundreds, 3 tens, 1 ones
- 1 hundreds, 8 tens, 0 ones
- 2 hundreds, 0 tens, 3 ones
Need more practice?
Using the one, ten, and hundred dollar bills, practice trading ten of one type of bill for one of the next value.
Exercise 4
Write the place value name (ones, tens, hundreds) for each underlined digit. Check your work using the answer key at the end of the exercise.
- 622 hundreds
- 468 tens
- 920
- 920
- 648
- 426
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