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One or Two Less
How many beads?
20
1 less than 20 is …?
19
20 – 1 is …? Tell me the complete number sentence.
20 – 1 = 19
How many beads?
2 less than 30 is …?
30
Tell me the complete number sentence.
30 - 2 = 28
More Practice
48
50 - 2 =
39
40 - 1 =
Take Out Ten
59
60 - 1 =
68
70 - 2 =
When I say 10 – 9, you say 10 – 9 = 1. Ready?
10 – 9
88
79
90 - 2 =
80 - 1 =
10 – 2
10 – 5
Let’s take out 10 from each number. I say 30. You draw a number bond for 30 with parts 20 and 10.
Show the ten on the right.
10 – 4
10 – 6
10 – 8
10 – 7
100 - 1 =
99
When I say 1, you say 9. Ready?
1
9
When I say 2, you say 8. Ready?
2
8
3....4.....5.....
30
Show me your board.
Read the parts from left to right
30
20 10
Lesson 6
Concept Development
1
10 - 9 =
Watch.
11
10 – 9 = 1 and 10 + 1 = 11
21
30 - 9 =
Talk to your partner. How do the two number sentences relate to what we showed with our drawing?
The 10 minus 9 shows how we took from the ten. The 10 and the 1 are the parts that are left. We add them together, so 20 – 9 = 11. It’s like Take Out Ten! We broke 20 into 10 and 10, so we could take 9 from the ten. Then we added what was left.
Explain to your partner how 10 – 9 helps us to solve 30 – 9
They’re the same, but 30 has 2 more tens. 10 is inside 30 so you take from the ten. I know 30 is 20 + 10 and 10 – 9 is 1, so then I added 20 and 1.
Knowing our partners of ten makes that easy! You noticed we always took from ten. After that, we put the parts that are left together.
Objective: Subtract single-digit numbers from multiples of 10 within 100.
Watch.
40 - 9 =
31
30 10
Problem Set!!
What is the first step to solve?
Take from 10.
Give me the number sentence to take from ten.
10 – 9 = 1.
Application Problem
What is the next step?
Add the parts that are left
Mary buys 30 stickers. She puts 7 in her friend’s backpack. How many stickers does Mary have left?
Give me the number sentence.
23
7
30 + 1 = 31
30
30 - 7 = 23
Try Some on Your Own!
Mary has 23 stickers left.
20 10
30 – 5
80 – 6
100 – 7
50 – 9
20 - 9 =
10 10