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Know the $GGDQGVXEWUDFWZLWKLQGHPRQVWUDWLQJIOXHQF\IRUDGGLWLRQDQG
addition facts (sums to 20) and the corresponding
VXEWUDFWLRQZLWKLQ8VHVWUDWHJLHVVXFKDVFRXQWLQJRQPDNLQJWHQHJ subtraction facts and commit them to memory.
GHFRPSRVLQJDQXPEHUOHDGLQJWRDWHQHJ± ±± ± XVLQJWKHUHODWLRQVKLSEHWZHHQDGGLWLRQDQGVXEWUDFWLRQHJNQRZLQJWKDW
RQHNQRZV± DQGFUHDWLQJHTXLYDOHQWEXWHDVLHURUNQRZQVXPVHJ
DGGLQJE\FUHDWLQJWKHNQRZQHTXLYDOHQW UNDERLYING SKILLS AND CONCEPTS:
counting; addition concepts;
one more, one less;
basic facts recall
Learn Addition Facts: Doubles-Plus-One
a
K
ey Ide
You can use doubles to help you add when one
addend is 1 more than the other.
Doubles have 2 addends that are the same.
Double-plus-one have one addend that is
1 more than the other.
E x am p l E
If 4 ! 4 " 8, what is the sum of 4 ! 5?
A – © CSL Associates, Inc. All rights reserved.
Use the picture to find the sum.
What doubles fact can help?
Doubles:
4!4"8
Double-plus-one
4!5"4!4
Chapter 5 – Lesson 4
!1 " 9
page 57
Name
P RAC T I C E
Write a number sentence. Add.
1
2
459
3
8 7 15
5 6 11
4
437
5
77
14; 8 7 15 or 7 8 15
6
44
8; 4 5 9 or 5 4 9
7
66
12; 6 7 13 or 7 6 13
Math
Reasoning
8
Number Sense
MR 1.1
One room has 5 windows.
Another room has 6 windows.
How many windows are there in all?
What double and double-plus-one fact can you use?
11 windows; 5 5 10, so 5 6 11
page 58
Chapter 5 – Lesson 4
A – © CSL Associates, Inc. All rights reserved.
Find the doubles fact. Then write a double-plus-one fact.
Name
…at home!
P RAC T I C E
Write a number sentence. Add.
2
1
347
3
459
4
6 5 11
235
5
66
12; 7 6 13 or 6 7 13
6
55
10; 5 6 11 or 6 5 11
7
77
14; 7 8 15 or 8 7 15
Math
Reasoning
8
Number Sense
MR 1.1
One room has 6 chairs.
Another room has 7 chairs.
How many chairs are there in all?
What double and double-plus-one fact can you use?
13 chairs; 6 6 12, so 6 7 13
page 40
Home Resource and Homework
Chapter 5 Lesson 4
A – © CSL Associates, Inc. All rights reserved.
Find the doubles fact. Then write a double-plus-one fact.
MCX94TEG1Ch01_30.v8.4.1 2/19/01 19:18 Page 107
Name
P RAC T I C E
Write a number sentence. Add.
1
2
5 6 11
459
4
3
437
8 7 15
A – © CSL Associates, Inc. All rights reserved.
Find the doubles fact. Then write a double-plus-one fact.
5
77
14; 8 7 15 or 7 8 15
6
44
8; 4 5 9 or 5 4 9
7
66
12; 6 7 13 or 7 6 13
Math
Reasoning
8
Number Sense
MR 1.1
One room has 5 windows.
Another room has 6 windows.
How many windows are there in all?
What double and double-plus-one fact can you use?
11 windows; 5 5 10, so 5 6 11
Chapter 5 – Lesson 4
Student Book Page
page 58
Name
…at home!
P RAC T I C E
Write a number sentence. Add.
2
1
347
3
459
4
6 5 11
235
5
66
12; 7 6 13 or 6 7 13
6
55
10; 5 6 11 or 6 5 11
7
77
14; 7 8 15 or 8 7 15
Math
Reasoning
8
Number Sense
MR 1.1
One room has 6 chairs.
Another room has 7 chairs.
How many chairs are there in all?
What double and double-plus-one fact can you use?
13 chairs; 6 6 12, so 6 7 13
page 40
Home Resource and Homework
Chapter 5 Lesson 4
A – © CSL Associates, Inc. All rights reserved.
Find the doubles fact. Then write a double-plus-one fact.