Secret Agent Equations Worksheet
Case File #1 Addition & Subtraction to 20
Secret Agent Equations
Agent:
Date:
A Part A: Target at the End (5 Clues)
Solve each equation. Write the mystery number inside the empty box and show your work!
e.g. \(10 + 4 = \boxed{\quad}\) | \(16 - 5 = \boxed{\quad}\)
#1
12 + 6 =
Show Work / Thinking:
01234567891011121314151617181920
#2
19 − 5 =
Show Work / Thinking:
01234567891011121314151617181920
#3
8 + 7 =
Show Work / Thinking:
01234567891011121314151617181920
#4
16 − 7 =
Show Work / Thinking:
01234567891011121314151617181920
#5
9 + 5 =
Show Work / Thinking:
01234567891011121314151617181920
Strategy: Start at the first number. Hop forward for (+) or hop backward for (−).
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Case File #2 Missing Addends & Subtrahends
Secret Agent Equations
Agent:
Date:
B Part B: Target in the Middle (5 Clues)
Find the missing middle number. Write it inside the empty box and count your hops!
e.g. \(3 + \boxed{\quad} = 11\) | \(14 - \boxed{\quad} = 8\)
#6
4 +
= 13
Show Work / Thinking:
01234567891011121314151617181920
#7
17 −
= 12
Show Work / Thinking:
01234567891011121314151617181920
#8
8 +
= 15
Show Work / Thinking:
01234567891011121314151617181920
#9
19 −
= 13
Show Work / Thinking:
01234567891011121314151617181920
#10
5 +
= 18
Show Work / Thinking:
01234567891011121314151617181920
Strategy: Start at the known number and count the hops on the clue track to reach the target!
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