TEACHER EDITION
Numbers to One Billion
Math Book 5 · sheet 1
Warm-up — yesterday: Grade 4 — comparing large numbers
Which is greater, 84,060 or 84,600?84,600
What we are learning
The places run in groups of three — ones, thousands, millions, billions — and each comma marks the end of a group.
How it is done — keep this beside you
These steps stay on your page while you work. If you get stuck, find the step you are on and read it again before you put your hand up.
1
A number with no commas is unreadable.
2438500000
2
Mark off three from the right.
2438500000
2438500,000
3
Three more.
2438500000
2438500,000
2438,500,000
4
Three more. Now the groups are visible.
2438500000
2438500,000
2438,500,000
2,438,500,000
5
Read the groups: two billion, four hundred thirty-eight million, five hundred thousand.
2438500000
2438500,000
2438,500,000
2,438,500,000
2,438,500,000
Practice
I DOteacher builds it, nothing erased
What is the value of the 6 in 6,204,000,000?
- Groups from the right: ones, thousands, millions, billions.
- The 6 is in the billions place.
- 6,000,000,000
WE DO 1together, on whiteboards
What is the value of the 3 in 1,350,000,000?
Mark the groups from the right first. Boards up.
- Hundred millions place.
- 300,000,000
WE DO 2together, on whiteboards
What is the value of the 7 in 40,700,000?
Count the groups — do not judge by how long it looks.
- Hundred thousands place.
- 700,000
YOU DOindependent, from the book
Book 5A p.4 — the Do section, clipped onto the slide
Ask yourself: “Which GROUP is this digit in — and which place inside that group?”
Watch for
Two questions, in that order. A child who tries to name the place directly on a ten-digit number will miscount. Group first, place second, every time.
Two questions, in that order. A child who tries to name the place directly on a ten-digit number will miscount. Group first, place second, every time.