This document is a math challenge worksheet that contains 12 math problems in subtraction format. Students are asked to complete the subtraction problems by filling in the blanks with the correct numbers to solve each problem. The document also includes a knock-knock joke to introduce the math challenge activity.

1. Name: Date:
Math Challenge
Knock-knock. Who's there? Ketchup. Ketchup who? Ketchup or you won't
win the race!
Complete the Activity.
1 2 3 4
28 14 26 27
–9 –5 –8 –9
5 6 7 8
16 26 16 27
–9 –9 –6 –8
9 10 11 12
19 26 15 19
–6 –7 –9 –5
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