Ray's New Practical Arithmetic · Art. 12 · Unit 1: Numeration
5. Reading large numbers
Goal: Your child points off any number into periods and reads it aloud correctly.
You'll need
- The book
- A slate, small whiteboard or scrap paper
- A notebook and pencil
What's in the book
Numeration, the reading of numbers: point off the periods from the right, then read each period from the left and name it. Then a list of numbers to be read.
The lesson, step by step
Warm-up
Write 3, 30, 300, 3000, 30000, 300000, 3000000. Your child reads them aloud.
The definition
Read:
Numeration is the reading of numbers when expressed according to a system of notation.
SayFirst we mark the periods from the right. Then we read from the left, saying each period's name.
Work an example
Write 763491. Point off: 763,491. Read: seven hundred sixty-three thousand, four hundred ninety-one.
Note that the units period's name is not said aloud.
Guided practice
Read the first numbers of the list together:
41582; 763491; 2519834.
Your child points off the periods with a pencil before reading.
Independent practice
Your child reads the rest of the list aloud. Write down any that cause trouble and try them again at the end.
Wrap-up
Write a number your child chooses, as long as they like, and have them read it. Then you read one they write.
Tip
Zeros in the middle of a period are where mistakes happen. Have your child say each period as a three-figure number first (030 is "thirty").