Everyday Math
Grade 1
Lesson 9.2
9.2 Adding and Subtracting Tens
Objective: To provide opportunities to develop proficiency in adding and
subtracting 10's.
Math Journal 2---- pages 179
Home Link for 9.1, page 255
Math Masters 249, 254, 256, 257
slate
1 die per partnership
My Reference Book, pages 142 and 143
Number-Grid Poster
game markers
stick-on notes
Class Data Pad
Minute Math+ page 42
base-10 blocks
Demonstrate subtracting 10's on this interactive 100 chart.
SPLAT SQUARE
Mental math and Reflexes
Write the number on your slate and circle the digit in the tens place.
80
39
12
34
55
43
Tabs are all click and reveal.
Math Message
Be ready to show how to use the
number grid to solve these
problems.
15 + 8 = _______
24 + 10 = _______
32 - 6 = _______
28 - 10 = _______
Page 179
Find charts like these inside the
covers of your math journal.
How are these charts alike and different?
How are they alike and different from the ones
in your journal?
Number Grid for Math Message Follow-Up
and Adding and Subtracting 10's
mentally
TG Page 748
My Reference Book
Pages 142 and 143
Number Grid Game
Materials:
1 number grid
1 six-sided die
1 game marker per player
Players: 2 or more
Skill: Counting on the number grid.
Object of the game: To land on 110 with an exact roll.
Roll
Spaces
1 or 10
2 or 20
Directions:
1. Players put their markers at 0 on the number grid.
2. Take turns. When it is your turn:
Roll the die
Use the table to see how many
spaces to move your marker.
Move your marker that many spaces.
3
3. Continue playing. The winner is the first player to land on 110 with
an exact roll.
5
Enrichment: Use 2 dice. For rolls of 7 to 12,
go that many spaces, respectively.
4
6
Identifying How Many Letters are in Your First
Name Line Plot Graph
First, make the graph with stick on notes and the Class Data Pad.
Then, use the red blocks to fill in this line plot graph.
2
3
4
5
6
7
8
9
10+
Math Masters, page 254
Using Rules to Solve Problems
Use number grids to solve to practice using the grid.
in
in
out
1
Rule
Add 1
4
7
10
out
27
39
9
2
6
38 5
28
Math Masters page 254
Using Rules to Solve Problems
in
out
in
Rule
+ 10
out
01 2 3 4 5 6 7 8 9
10 11 12
Math Masters Page 254
Using Rules to Solve Problems
Use number grids to solve.
Writing and Reasoning:
What is the pattern in the sums in
Problem 2 on page 179?
Home Link 9.2,
page 255
Adding and Subtracting 10's
Math Masters, page 256
Explore digit patterns when counting
forward and backward by multiples of
10 using base-10 blocks.
What pattern do you see when you are
finished with the page?
24
62
34
72
54
52
64
12
Finding
a Pattern
for 9's
Math Masters
Page 257
(next slide)
Demonstrate
9s pattern
on the
number grid.
Math
Masters
Page 257
Number
Grid ShortCuts
Finding a
Pattern for 9