Run sheet

Counting by Tens or Ones

Grade 2 · Lesson 2 · 23 slides · blocked practice

The big idea

Counting on by ten changes only the tens digit. Counting on by one changes only the ones — until the ones run out.

Slide by slide

#	On the screen	What you say
1	Today — WARM-UP	Point at the five parts. Name where we are.
2	How many tens and ones in 58?	Boards up on three. This is yesterday's work — Tens and Ones. Do not help each other; I need to see what each of you kept.
3	5 tens 8 ones answer — own slide	Show me. Everyone at once. Check your own board against this.
4	Today — I DO	We are at I DO. Boards down and flat.
5	Counting on by ten changes only the tens digit. Counting on by one changes only the ones — until the ones run out.	Read this out. Do not explain it yet — the example explains it.
6	34 build 1 of 5	Start at 34.
7	34 34 → 44 build 2 of 5	Add one ten. Only the tens digit moves.
8	34 34 → 44 34 → 44 → 54 build 3 of 5	Another ten.
9	34 34 → 44 34 → 44 → 54 34 → 35 build 4 of 5	Now back to 34 and add ONE. Only the ones digit moves.
10	34 34 → 44 34 → 44 → 54 34 → 35 +10: 34→44 +1: 34→35 build 5 of 5	Ten changes the tens. One changes the ones.
11	Count on by tens from 26, three times.	Now the same thing on a new one. Watch — nothing on your boards.
12	26 + 10 = 36 36 + 10 = 46 46 + 10 = 56 26, 36, 46, 56 answer — own slide	I say every step aloud as I write it. The board keeps all of it.
13	Today — WE DO	We are at WE DO. Boards up.
14	Count on by tens from 41, three times.	Only one digit should be changing. Boards up after each step.
15	41, 51, 61, 71 answer — own slide	Boards up. Everyone at once — check yours against this.
16	Count on by ones from 67, four times.	Careful at the end of this one.
17	67, 68, 69, 70, 71 answer — own slide	Boards up. Everyone at once — check yours against this.
18	Today — YOU DO	We are at YOU DO. Boards down, books open.
19	Dimensions 2A — page 8	Open your books to this page. Wait — do not start yet.
20	Do — page 8	These are the book's own problems, same type as the three we have just done. Work them in the book.
21	Today — CLOSURE	Last part. Answers up.
22	“Which digit should be changing?”	This is the question to ask yourself every time, not just today.
23	Count on by ten from 73. Show the next number.	One last board. Then we are finished.

Mini whiteboards, by segment

Segment	MWB	Time	Boards	What to hold
WARM-UP	retrieval	3-5 min	BOARDS UP	Question up, boards up on the count. Everyone shows at once — a child who waits to see a neighbour's board has not retrieved anything. Grade 2 may drop this if the previous lesson was a review — from Grade 4 it is not optional.
I DO	none — they watch	3-4 min	boards down	Boards 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 DO	primary use	5-6 min	BOARDS UP	One 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 DO	on the sheet	4-5 min	boards down	Boards down. This is the book's problems, worked where the work will be kept.
CLOSURE	answers displayed	2-3 min	boards down	Answers on the board, children check their own. Mark nothing here.

Watch for
The second WE DO crosses 69→70 deliberately. That crossing is where counting by ones stops being automatic, and a child who writes 610 has shown you exactly what they think a number is.