What they’re learning
Your child is learning that the position of a digit tells its value. In 472, the 4 means 400, the 7 means 70, and the 2 means 2. They should be able to build, read, write, and decompose numbers to 1,000.
Explain it to my child
A digit is like a person sitting in a seat: the seat changes how much the digit is worth. In 352, the 3 sits in the hundreds seat, so it means 300.
Try it together
Use three labelled spaces on the table: hundreds, tens, ones. Put coins, buttons, or LEGO pieces into each space to build numbers such as 243. Ask your child to say the number and then rebuild it a different way, such as 2 hundreds, 3 tens, and 13 ones.
Practice
- What is the value of the 6 in 684?
- Write 507 in expanded form.
- Build 329 as hundreds, tens, and ones.
- Which number has 8 hundreds, 0 tens, and 4 ones?
- What number is 400 + 70 + 9?
Check understanding
- Can your child explain why the same digit can have a different value in a different position?
- Can they decompose a three-digit number in more than one way?
Parent answer guide
- 600
The 6 is in the hundreds place. - 500 + 7
Zero tens can be omitted in expanded form. - 3 hundreds, 2 tens, 9 ones
Equivalent decompositions are also useful. - 804
- 479
Ontario curriculum connection
Grade 3 · Mathematics
Number · Whole numbers
Curriculum expectation: Specific expectation omitted because Lessonfield has not yet verified an expectation-level mapping for this guide.