Lesson 10 Write Number Riddles

- Let’s write and solve number riddles.

Warm-up True or False: Add within 100

Decide if each statement is true or false.

Be prepared to explain your reasoning.

$60 = 25 + 45$
$70 = 24 + 46$
$80 = 32 + 37$

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.