Second Grade: Week One (Answer Key)
1.
a.–c. Have an adult listen to your counting.
2.
a.
1.
2.
3.
4.
b.
c.
Pictures will vary.
Pictures and math sentences will vary.
a.
1.
3.
6 + 4 = 10 or 4 + 6 = 10
12 – 6 = 6
10 + 7 = 17 or 7 + 10 = 17
14 – 6 = 8
2.
3.
4.
5.
b.
1.
2.
WWWWW WWWWWW WWWWWWW
3.
4.
5.
c.
1.
..
2.
3.
4.
Have an adult check your patterns.
4.
a.
Match the group of shapes with their correct name.
1. triangles
2. quadrilaterals
3. pentagons
a.
4. hexagons
5. heptagons
6. octagon
b.
c.
d.
e.
f.
b. Use the pictures above to tell about the number of sides each shape
has. Then draw an example of that shape.
1. triangles – 3-sided polygon
2. quadrilaterals – 4-sided polygon
3. pentagons – 5-sided polygon
4. hexagons – 6-sided polygon
5. heptagons – 7-sided polygon
6. octagon – 8-sided polygon
*Drawn examples will vary.
c. A polygon is a closed figure of 3 or more line segments that meet
exactly at endpoints (no overlaps).
5.
6.
a.
1.
2.
3
4.
3 inches
6 inches
5 inches
7 inches
b.
Using a ruler, have an adult measure your line segments.
c.
Answers will vary.
a.-c.
Answers will vary.
Second Grade: Week Two (Answer Key)
1.
a.-c. Have an adult listen to your counting.
2.
Solve.
a.
1.
2.
3.
4.
5.
7
8
14
17
12
b.
1.
2.
3.
4.
5.
3
8
9
8
8
c.
NOTE: Order may vary!
3.
a.
1.
2.
3.
4.
5.
counting up by twos, or adding two
counting down by fives, or subtracting five
counting up by tens, or adding ten
counting up by fives, or adding five
counting down by twos, or subtracting two
b.
1.
2.
3.
4.
counting up by fours, or adding four
counting down by sevens, or subtracting seven
counting up by twenties, or adding twenty
counting up by five, then ten, then fifteen, or adding five,
then adding ten, then adding fifteen (multiples of five)
counting up by twenty-fives, or adding twenty-five
5.
c.
4.
Number patterns will vary.
a.
triangle
rectangle
pentagon rhombus
octagon
(parallelogram)
b.
1.
2.
(or any five-sided polygon)
3.
(or any six-sided polygon)
4.
(or any polygon with four equal-length sides and
no right angles)
5.
(
6.
c.
(or any four-sided polygon with two parallel
sides and no right angles)
(or any four-sided polygon with two sets of
parallel sides)
Answers will vary.
5.
a.-c. Using a ruler, have an adult check your measurements.
6.
a.-c. Discuss your findings with an adult.
Second Grade: Week Three (Answer Key)
1.
2.
3.
a.
Have an adult listen to you read the numbers.
b.
1.
2.
3.
4.
5.
87
136
704
3,515
9,211
c.
1.
2.
3.
4.
5.
860
1,205
4,901
81,273
99,032
a.
1.
2.
3.
4.
5.
17
35
39
53
When adding ten, look to the box below; when subtracting ten,
look to the box above.
b.
1.
2.
3.
4.
5.
45
67
63
7
When adding nine, look to the box below and then move one
space to the left; when subtracting nine, look to the box
above and then move one space to the right.
c.
Math sentences and patterns will vary.
a.
1.
2.
3.
4.
5.
8, 10, 12
16, 32, 64
50, 55, 60
500, 400, 300
40, 20, 0
b.
1.
2.
3.
4.
5.
12, 15, 18
80, 100, 120
33, 37, 41
12, 6, 3
46, 37, 28
c.
1.
2.
3.
4.
5.
40, 25, 10
4, 2, 1
–2, –3, –4
13, 21, 34
Have an adult check your pattern.
4.
Share your work with an adult.
5.
a.
1.
2.
3.
4.
2 1/2 inches
3 1/2 inches
5 inches
5 1/2 inches
b.
1.
2.
3.
4.
7 1/2 cm.
5 1/2 cm.
14 cm.
12 1/2 cm.
c.
Using a ruler, have an adult measure your like segments.
6.
Charts and answers will vary.
Second Grade: Week Four (Answer Key)
1.
2.
a.
1.
2.
3.
4.
5.
15 < 17
26 < 31
148 < 240
330 = 330
856 > 854
b.
1.
2.
3.
4.
5.
3+5< 9
4 + 6 = 10
15 – 8 > 6
20 + 5 = 17 + 8
13 – 4 > 16 – 9
c.
1.
2.
3.
4.
5.
twelve hundred = one thousand, two hundred
3 + 49 = 26 + 26
18 + 10 > 32 – 5
six hundred forty-two < six hundred forty-nine
3 + 5 + 9 > 27 – 11
a.
18
19
21
22
23
1.
17
20
33
34
37
38
2.
32
35
33 35
39
45
36
49 51 53
57
61
3.
37
50
41 43
55
65
47
55
70
80
59
90
95
4.
60
75
85
100
b.
1.
2.
5
6
26
16
36
26
46
36
56
46
66
56
76
3.
27
28
47
77
78
4.
13
45
22
54 55 56
31
63 64 65 66 67
33
42
72 73 74 75 76 77 78
24
43
35
44
53
81 82 83 84 85 86 87 88 89
c.
1.
259
269
2.
260
534
544
535
536
554
555
556
279
566
289
576
299
309
584
585
586
3.
752
758
763
767
774
776
784 785 786
794 795 796
803
807
812
3.
4.
818
a.
1.
2.
3.
4.
33, 43
54, 45
28, 52
36, 24
b.
1.
2.
3.
4.
45, 113
94, 60, 43
0, 46, 69
14, 33, 52
c.
1.
2.
3.
4.
1/2, 4
add 4
1, 9, 27
double, then add 1
a.
1.
2.
3.
4.
E
P
S
R
b.
1.
2.
3.
4.
triangle
hexagon
parallelogram
trapezoid
4. Have an adult look at your
number grid.
c.
5.
a.
b.
c.
6.
CATS
Using a ruler, check to make sure your line segment measures
4 inches.
Kristen’s hand – 7 inches
Robert’s hand – 5 1/2 inches
Mark – 5 feet
Jim – 3 feet
Mike – 4 1/2 feet
David – 3 1/2 feet
Steve – 2 feet
a.
1.
2.
3.
4.
Amy
Fred
Celia
4 points
b.
1.
2.
3.
4.
girls
Bob
Amy
Donald
c.
1.
Amy (98), Donald (97), Emily (91), Bob (90), Celia (81), Fred
(77)
21 points
Answers may vary. Both Bob and Celia maintained or
increased their scores from week to week.
2.
3.