FLIGHT LOGBOOK

MINUS MISSION

TEACHER ANSWER KEY • LEVEL 1

ANSWER KEY STAGE 1 VERIFIED

STAGE 1: CRUISING ALTITUDE (ANSWERS)

Completed logbook details for vertical alignment subtraction. No borrowing is required. Ensure students align thousands, hundreds, tens, and ones columns.

1

Th

H

T

O

8

7

5

4

-

3

4

2

1

5

3

3

3

2

Th

H

T

O

5

9

6

8

-

1

5

3

2

4

4

3

6

3

Th

H

T

O

9

4

7

6

-

6

2

4

3

3

2

3

3

4

Th

H

T

O

7

6

3

9

-

2

5

1

8

5

1

2

1

5

Th

H

T

O

6

8

8

5

-

4

3

2

1

2

5

6

4

6

Th

H

T

O

4

5

9

7

-

2

1

3

5

2

4

6

2

CO-PILOT CHECK: STAGE 1 MASTERED • ANSWERS ALL VERIFIED

FLIGHT LOGBOOK

MINUS MISSION

TEACHER ANSWER KEY • LEVEL 2

ANSWER KEY STAGE 2 VERIFIED

STAGE 2: CLOUDY SKIES (ANSWERS)

Completed logbook details with regrouping tracking. Red boxes represent regrouped digits that students should write in their logbook. Striking through the digits shows borrowed values.

7

Th

H

T

O

7

12

6

5

8

2

-

2

3

4

7

4

2

3

5

8

Th

H

T

O

3

12

7

4

2

9

-

3

1

8

4

4

2

4

5

9

Th

H

T

O

7

12

8

2

6

4

-

4

5

1

3

3

7

5

1

10

Th

H

T

O

2

10

16

5

3

1

6

-

2

1

5

8

3

1

5

8

11

Th

H

T

O

8

10

14

9

1

4

5

-

6

3

8

2

2

7

6

3

12

Th

H

T

O

3

11

14

13

4

2

5

3

-

1

6

7

5

2

5

7

8

CO-PILOT CHECK: STAGE 2 MASTERED • ANSWERS ALL VERIFIED

FLIGHT LOGBOOK

MINUS MISSION

TEACHER ANSWER KEY • LEVEL 3

ANSWER KEY STAGE 3 VERIFIED

STAGE 3: STORMY WEATHER (ANSWERS)

Completed logbook details for subtraction across zeros. Regrouping requires borrowing across multiple columns. Guide students to complete each zero step-by-step from left to right as shown in red boxes.

13

Th

H

T

O

6

9

10

7

0

0

5

-

3

4

2

1

3

5

8

4

14

Th

H

T

O

4

9

9

10

5

0

0

0

-

1

8

3

4

3

1

6

6

15

Th

H

T

O

7

9

13

10

8

0

4

0

-

2

3

6

7

5

6

7

3

16

Th

H

T

O

5

9

9

13

6

0

0

3

-

2

4

7

5

3

5

2

8

MISSION DEBRIEF: SAMPLE EXPECTED ANSWERS

1. Which problem in Stage 3 felt like the strongest turbulence, and how did you navigate through it?

Problem 14 (5000 - 1834) because I had to jump all the way to the Thousands column. I navigated by changing 5 to 4, making the zeros into 9s, and the final zero into 10.

2. Complete the flight rule: "When regrouping across a zero, I must first visit the column in the..."

...next non-zero place value on the left to borrow first, then pass it back across.

FLIGHT COMMAND: STAGE 3 MASTERED • COMPLETE SET CERTIFIED

Minus Mission Answer Key

Minus Mission Answer Key

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