Warm-up True or False: Add within 100
Decide if each statement is true or false.
Be prepared to explain your reasoning.
Activity 1 Write Number Riddles
Our secret number:
Our 4 clues:
Write each clue on an index card.
Make sure the last clue is an addition expression.
Fold that clue in half.
Activity 2 Solve Our Number Riddles
Record your ideas as you solve each number riddle.