G2 U6 Assessment
Name__________________________________ Date_______________
Grade 2 Unit 6 Assessment Subtraction Note: The classroom teacher reads the test questions aloud to students.
1.
Willard set up his place value mat to subtract 286 from 695. What does he need to do next? 695 – 286 = Hundreds
Tens
Decompose a hundred square into 10 ten rods. Decompose a ten rod into 10 unit cubes. Decompose a hundred square into 100 unit cubes. Compose the unit cubes into a ten rod.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 1
Ones
For questions 2 and 3, use the number sentence 368 – 124 =. 2.
Solve. 368 – 124 =
242
3.
224
244
124
Think about how you found the difference. Which statement is true?
I had to regroup the tens place. I had to regroup the ones place. I had to regroup the hundreds place. I did not need to regroup at all.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 2
4.
Solve. 73 – 28 =
45
5.
55
52
42
Which number sentence completes the following set of related facts? 38 + 12 = 50 12 + 38 = 50 50 – 38 = 12
50 + 12 = 38
6.
38 – 12 = 50
50 – 12 = 38
38 + 50 = 12
Leonard solved this subtraction problem. Which related addition problem could help him check his work? 85 – 27 = 58
85 + 58 = 143
58 + 27 = 85
85 – 58 = 27
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 3
85 + 27 = 112
7.
Solve. 543 – 25 =
528
8.
512
518
522
Mr. Zack read this problem aloud for his students to solve. This is Mario’s work. PROBLEM:
four hundred fifty minus one hundred twenty five Mario 450 –125 120
What two statements would be helpful to Mario? Line up the digits in their place value columns. You can only subtract ones from ones, tens from tens, and hundreds from hundreds. Remember to regroup when subtracting 5 from 5. The difference should be greater than both of the other numbers. Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 4
For questions 9-10, use Janet’s work sample below. Janet 45 –28 27
9.
Janet solved this problem incorrectly. What did she do wrong? After she unbundled a ten, she forgot to add them to the ones. She added when she should have subtracted. Janet forgot to show she regrouped the tens place. She regrouped when it wasn’t needed.
10.
Solve the problem correctly. 45 –28
13
7
23
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 5
17
11.
Solve. 802 – 161 =
639
12.
739
741
641
Which two statements are true about subtraction?
You can check your work with addition. Subtraction still works even if the numbers are not lined up in their place value columns. Sometimes you need to decompose hundreds or tens to solve a subtraction problem. The difference is always the smallest number in a subtraction problem.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 6
For questions 13-15, find the differences and select your response from the numbers in the Answer Bank. One item in the Answer Bank will not be used.
13.
Answer Bank
91 –32
690 590 59 61
14.
785 – 195 =
15.
80 – 19 =
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 7
16.
Subtract. Show your work. 618 – 446 =
Use addition to prove your answer is correct. Show your work.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 8
Grade 2 Unit 6 Assessment Subtraction Note: The classroom teacher reads the test questions aloud to students.
1.
Willard set up his place value mat to subtract 286 from 695. What does he need to do next? 695 – 286 = Hundreds
Tens
Decompose a hundred square into 10 ten rods. Decompose a ten rod into 10 unit cubes. Decompose a hundred square into 100 unit cubes. Compose the unit cubes into a ten rod.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 1
Ones
For questions 2 and 3, use the number sentence 368 – 124 =. 2.
Solve. 368 – 124 =
242
3.
224
244
124
Think about how you found the difference. Which statement is true?
I had to regroup the tens place. I had to regroup the ones place. I had to regroup the hundreds place. I did not need to regroup at all.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 2
4.
Solve. 73 – 28 =
45
5.
55
52
42
Which number sentence completes the following set of related facts? 38 + 12 = 50 12 + 38 = 50 50 – 38 = 12
50 + 12 = 38
6.
38 – 12 = 50
50 – 12 = 38
38 + 50 = 12
Leonard solved this subtraction problem. Which related addition problem could help him check his work? 85 – 27 = 58
85 + 58 = 143
58 + 27 = 85
85 – 58 = 27
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 3
85 + 27 = 112
7.
Solve. 543 – 25 =
528
8.
512
518
522
Mr. Zack read this problem aloud for his students to solve. This is Mario’s work. PROBLEM:
four hundred fifty minus one hundred twenty five Mario 450 –125 120
What two statements would be helpful to Mario? Line up the digits in their place value columns. You can only subtract ones from ones, tens from tens, and hundreds from hundreds. Remember to regroup when subtracting 5 from 5. The difference should be greater than both of the other numbers. Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 4
For questions 9-10, use Janet’s work sample below. Janet 45 –28 27
9.
Janet solved this problem incorrectly. What did she do wrong? After she unbundled a ten, she forgot to add them to the ones. She added when she should have subtracted. Janet forgot to show she regrouped the tens place. She regrouped when it wasn’t needed.
10.
Solve the problem correctly. 45 –28
13
7
23
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 5
17
11.
Solve. 802 – 161 =
639
12.
739
741
641
Which two statements are true about subtraction?
You can check your work with addition. Subtraction still works even if the numbers are not lined up in their place value columns. Sometimes you need to decompose hundreds or tens to solve a subtraction problem. The difference is always the smallest number in a subtraction problem.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 6
For questions 13-15, find the differences and select your response from the numbers in the Answer Bank. One item in the Answer Bank will not be used.
13.
Answer Bank
91 –32
690 590 59 61
14.
785 – 195 =
15.
80 – 19 =
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 7
16.
Subtract. Show your work. 618 – 446 =
Use addition to prove your answer is correct. Show your work.
Copyright © Swun Math Grade 2 Unit 6 Assessment, Page 8
