Students identify two-digit numbers represented with base-ten blocks and use their answers to solve a mystery riddle! Each task card shows a collection of tens and ones for students to count and match to a number on the included hundreds chart.

As students solve the cards, they color the corresponding numbers on the chart. The completed pattern reveals the answer to the riddle.

Students will practice:

• Counting tens and ones
• Identifying numbers shown with base-ten blocks
• Connecting concrete models to standard form
• Working with two-digit numbers to 100
• Locating numbers on a hundreds chart

This activity is ideal for first or second grade and can be used for independent practice, partner work, a math center, small-group instruction, or place value review.