Mountain Peak Math Challenge

This is very common at this level. Use concrete manipulatives like base-ten blocks, bundled straws, or even dimes and pennies to show that 10 ones equal 1 ten. Have your student physically regroup the objects, then record what they see on paper. Practice several problems where regrouping IS needed, highlighting that moment when ones add up to 10 or more. Celebrate these 'regrouping moments' as they work through the Mountain Peak Challenge.

All three are valid! At the medium difficulty level in Grade 3, students should be transitioning from concrete (fingers, objects) to representational (drawings, diagrams) to abstract (written algorithms). Encourage your student to use whatever strategy they're most comfortable with, but gently guide them toward the standard algorithm (lining numbers up vertically and adding column by column) since that's faster for larger numbers like those in this challenge.

Your student should be able to: (1) quickly add two single-digit numbers within 20, (2) understand that tens and ones are different place values, and (3) successfully add two-digit numbers without regrouping. If they can do these things, they're ready. If not, start with simpler two-digit problems and gradually increase difficulty before tackling this worksheet.

Don't just mark it wrong. Instead, have them re-solve it while explaining their thinking out loud. Ask specific questions: 'Did you add the ones column first?', 'Do the ones add up to 10 or more?', 'Did you remember to add the carried-over number?' This helps identify whether the error was a careless mistake, a misunderstanding of place value, or a regrouping error—each needs different support.