Transcript Slide 1

2nd Grade Math
Study Guide
2011-12
Part 1
Pages 1-14
Revised 8/2010
Showing Numbers to 99 in Different Ways
Pick a 2-digit number.
Write your number
in standard form.
Draw it.
Write your number
in expanded form.
Write your number
in words.
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Numbers Shown Different Ways in My World
Page 1
1. Look at the base ten blocks below.
How do you write this number in standard form?
a) 86
b) 608
c)
806
d) 68
2. Put an “X” on the number below which does not belong.
7 tens and 2 ones
72
20 + 7
Seventy - two
Page 2
Comparing and Ordering Numbers to 99
What does this mean to you? Show how it is used.
G
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What does this mean to you? Show how it is used.
L
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Show how you would order 3 numbers from greatest to least.
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Comparing and Ordering Numbers in My World
Page 3
1. Which is true?
a) 15 > 31
b) 67 > 74
c) 39 < 36
d) 60 > 52
2. Which group of numbers is written from greatest to least?
a) 67, 65, 82, 51
b) 65, 67, 51, 82
c) 51, 65, 67, 82
d) 82, 67, 65, 51
Page 4
Number Lines and Hundred Chart Patterns
Label the dots on the number line.
36
37 38
Make a +20 pattern on the chart below.
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100
Describe your pattern 3 ways:
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_________________________________________________
_________________________________________________
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Number Lines and Hundred Chart
Patterns in My World
Page 5
1. Which number is at point W?
W
53 54 55
2.
64 65 66
Make a -10 pattern starting at 86.
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100
Write 4 numbers in this pattern.
_____,
_____,
_____, _____
Page 6
Numbers to 999
32 5
Write a 3-digit number in standard form.
8 4 6
___________
Write the same number in expanded form.
___________________________________________
Show your number one more way.
Order the numbers
222, 212, and 220
from least to greatest.
L

H
T
G
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Big Numbers in My World
Page 7
O
1. Write the number shown by each model.
Which is the smallest number?
2. Meghan scored 322 points. Jill scored 232 points,
and Lucy scored 223 points. List the scores from
greatest to least.
H
T
O
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Page 8
Adding 2-Digit Numbers
Draw blocks to solve the
following problem.
27
+ 35
Tens
Ones
____
____
What does re-grouping mean? ____________________
_______________________________________________
Why do we re-group? ____________________________
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Addition of Big Numbers in My World
Page 9
1. The Bane Elementary cafeteria sold 55 bananas
and 37 apples during lunch.
How many apples and bananas did they sell?
a) 82
b) 81
c) 92
d) 22
2. Circle the facts red if re-grouping is necessary.
Circle them blue if there is no re-grouping.
19
+ 11
78
+ 13
48
+ 4
32
+ 17
10
+ 30
87
+ 54
53
+ 48
Page 10
Subtracting 2-Digit Numbers
Draw blocks to solve the
following problem.
32
-18
Tens
Ones
____
____
How is re-grouping different in subtraction than in addition?
________________________________________________
________________________________________________
________________________________________________
________________________________________________
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Subtraction of Big Numbers in My World
Page 11
1. Twenty-three chicks hatched in first grade.
Students took home sixteen of them.
How many chicks were left at school?
a) 13
b) 17
c) 39
d)
7
In the present, write two
subtraction facts
that need regrouping.
In the treasure chest, write two
subtraction facts that do not need
regrouping.
Page 12
Fact Families
Sue has 18 birds in her backyard.
_______ birds flew away.
Do the 4-step process to find out how many birds
are still in the backyard.
_______ birds are still in the backyard.
Write the members of the fact family.
_____________
_____________
_____________
_____________
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Fact Family Patterns in My World
Page 13
1. Jason’s family was moving.
He counted 9 boxes on the truck.
His dad put on 6 more boxes.
Now there are 15 boxes loaded on the truck.
Which number sentence is NOT in this fact family?
a) 9 + 6 = 15
b) 3 + 6 = 9
c) 15 - 6 = 9
d) 6 + 9 = 15
2. Look at the numbers in the house.
Write the number sentences for this fact family.
_____________
13
_____________
6
7
_____________
_____________
Page 14