Run sheet

Dividing by 10, 100, and 1,000

Grade 5 · Lesson 3 · 23 slides · blocked practice

The big idea

Dividing by ten moves every digit one place to the RIGHT — the same chart, the other direction.

Slide by slide

#On the screenWhat you say
1Today — WARM-UPPoint at the five parts. Name where we are.
2Show 74 × 100.Boards up on three. This is yesterday's work — Multiplying by 10, 100, and 1,000. Do not help each other; I need to see what each of you kept.
37,400 answer — own slideShow me. Everyone at once. Check your own board against this.
4Today — I DOWe are at I DO. Boards down and flat.
5Dividing by ten moves every digit one place to the RIGHT — the same chart, the other direction.Read this out. Do not explain it yet — the example explains it.
6| 4 | 2 | 0 | 0 | build 1 of 54,200 in the chart.
7| 4 | 2 | 0 | 0 |
420 build 2 of 5
Divide by ten: everything shifts one place right.
8| 4 | 2 | 0 | 0 |
420
420 build 3 of 5
The zero on the end was holding a place that is no longer needed.
9| 4 | 2 | 0 | 0 |
420
420
42 build 4 of 5
Divide by ten again.
10| 4 | 2 | 0 | 0 |
420
420
42
4,200 ÷ 100 = 42 build 5 of 5
So ÷ 100 is two shifts right.
113,600 ÷ 100Now the same thing on a new one. Watch — nothing on your boards.
12Two shifts right.
36 answer — own slide
I say every step aloud as I write it. The board keeps all of it.
13Today — WE DOWe are at WE DO. Boards up.
1485,000 ÷ 1,000Three shifts. Boards up when every digit has landed.
1585 answer — own slideBoards up. Everyone at once — check yours against this.
169,040 ÷ 10There is a zero inside this number, not just on the end.
17904 answer — own slideBoards up. Everyone at once — check yours against this.
18Today — YOU DOWe are at YOU DO. Boards down, books open.
19Dimensions 5A — page 12Open your books to this page. Wait — do not start yet.
20Do — page 12These are the book's own problems, same type as the three we have just done. Work them in the book.
21Today — CLOSURELast part. Answers up.
22“Which direction, and how many places?”This is the question to ask yourself every time, not just today.
23Show 7,200 ÷ 100.One last board. Then we are finished.

Mini whiteboards, by segment

SegmentMWBTimeBoardsWhat to hold
WARM-UPretrieval3-5 minBOARDS UPQuestion up, boards up on the count. Everyone shows at once — a child who waits to see a neighbour's board has not retrieved anything.
I DOnone — they watch3-4 minboards downBoards DOWN and flat. This segment is watching, and a child writing is not watching. Say so once at the start of the year and then hold it.
WE DOprimary use5-6 minBOARDS UPOne step, then boards up. Do not let them run ahead to the answer — the point is that everybody is on the same step at the same time.
YOU DOon the sheet4-5 minboards downBoards down. This is the book's problems, worked where the work will be kept.
CLOSUREanswers displayed2-3 minboards downAnswers on the board, children check their own. Mark nothing here.
Watch for
9,040 is chosen because 'cross off a zero' takes the wrong one. The shift is the method; deleting zeros is a trick that breaks here and the child can see it break.