Chapter 5 Numbers to 20
Exercise 1
Basics
1 Circle a group of 10.
Then write the missing numbers.
10 and is 14.
10 + = 14
10 and is .
10 + =
10 and is .
10 + =
is 10 and .
= 10 +
5-1 Numbers to 20 83
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Practice
2 Complete the number bonds.
(a) ( b) 13 (c) 11
10 9 10 1
3 Circle 10.
Write how many in all.
84 5-1 Numbers to 20
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Chapter 6 Addition to 20
Exercise 1
Basics
1
There are 8 balls.
There are 5 ducks.
How many toys are there in all?
+ =
8 + 5 =
There are toys in all.
Practice
2 Add 7 and 6.
+ =
7 + 6 =
6-1 Add by Making 10 — Part 1 101
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3 Add.
9+2= 7+5=
8+6= 9+4=
7+4= 9+7=
6+5= 8+8=
102 6-1 Add by Making 10 — Part 1
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5 (a) 9 + 6 = ( b) 8 + 3 =
1 5 2
(c) 7 + 5 = (d ) 8 + 4 =
(e) 9 + 2 = (f ) 9 + 5 =
6 (a) 7 + 6 = ( b) 8 + 5 =
(c) 9 + 9 = (d ) 5 + 7 =
(e) 9 + 5 = (f ) 7 + 7 =
104 6-1 Add by Making 10 — Part 1
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Exercise 2
Basics
1 Subtract 6 from 14.
14 − 6 =
2 (a) ( b)
13 − 7 = +3 15 − 6 = +5
13 − 7 = 15 − 6 =
(c) (d )
11 − 5 = +1 12 − 4 = +2
11 − 5 = 12 − 4 =
7-2 Subtract from 10 — Part 2 121
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Practice
3 Subtract.
14 − 5 = 13 − 6 =
12 − 7 = 11 − 6 =
16 − 7 = 12 − 6 =
11 − 2 = 15 − 6 =
122 7-2 Subtract from 10 — Part 2
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6 (a) 13 − 6 = +3 ( b) 15 − 7 = +5
10 3 10
(c) 11 − 4 = +1 (d ) 12 − 5 = +2
10 10
7 (a) 14 − 6 = ( b) 16 − 7 =
10 4 10
(c) 11 − 5 = (d ) 15 − 6 =
10 10
8 (a) 12 − 7 = ( b) 13 − 4 =
(c) 11 − 6 = (d ) 14 − 7 =
124 7-2 Subtract from 10 — Part 2
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Exercise 3
Basics
1 Subtract 7 from 15.
15 − 7 =
12 − 2 = 12 − 5 = 10 − 12 − 5 =
14 − 4 = 14 − 6 = 10 − 14 − 6 =
7-3 Subtract the Ones First 125
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Practice
4 Subtract.
11 − 8 = 12 − 4 =
13 − 8 = 14 − 7 =
15 − 6 = 18 − 9 =
16 − 9 = 11 − 6 =
126 7-3 Subtract the Ones First
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5 (a) 15 − 8 = 10 − ( b) 13 − 5 = 10 −
5 3
(c) 11 − 2 = 10 − (d ) 12 − 9 = 10 −
1 2
(e) 16 − 9 = 10 − ( f ) 13 − 4 = 10 −
6 3
6 Subtract.
Use any method.
13 − 7 = 15 − 8 =
12 − 3 = 14 − 8 =
7-3 Subtract the Ones First 127
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7 (a) 11 − 9 = ( b) 13 − 6 =
(c) 12 − 6 = (d ) 11 − 7 =
(e) 16 − 8 = ( f ) 14 − 9 =
15 pelicans are on the beach.
If 7 of them fly away,
how many pelicans will be left on the beach?
− =
pelicans will be left on the beach.
128 7-3 Subtract the Ones First
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Exercise 4
Check
1 (a) Write the numbers in order from least to greatest.
13 11 7 15 9
1st
( b) In the 6th box, write the number that comes next in the pattern.
(c) Add the 1st and 3rd number in the pattern.
(d ) Subtract the 1st number from the 6th number in the pattern.
(e) Add the first 2 numbers in the pattern.
( f ) Subtract the 2nd number from the 5th number in the pattern.
9-4 Review 2 167
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4
Logan gave away 9 shirts.
He now has 6 shirts.
How many shirts did he have at first?
He had shirts at first.
Lucia had 9 flowers.
She gave some of them to her sister.
She now has 6 flowers.
How many did she give away?
She gave away flowers.
9-4 Review 2 169
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6 Cross out any that are less than 15.
7+9 8+3 19 − 3 11 + 3 16 − 5
7 Cross out any that are more than 8.
5+6 2+5 17 − 8 11 − 4 17 − 6
8 Cross out the one that does not belong.
Challenge
9 How many squares are there? (There are more than 9.)
There are squares.
170 9-4 Review 2
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