1st Grade · Math · Parent guide
Short answer. This standard asks first graders to see 34 as 3 tens and 4 ones. What place value means, why teen numbers are tricky, and easy practice with real objects.
Quick answer
This is the place value standard. Your child learns that in a number like 34, the 3 is not just a three, it stands for 3 tens, and the 4 stands for 4 ones. Along the way he learns three specific ideas: that 10 ones can be bundled into a single ten, that teen numbers like 15 are one ten plus some ones, and that 20, 30, 40 and so on are just counts of tens with nothing left over.
Why parents see this skill
Place value is the load-bearing wall of elementary math. Every adding and subtracting strategy your child meets from here through fifth grade, carrying, borrowing, mental math with big numbers, rests on knowing that digits mean tens and ones. Kids who skip this and just memorize procedures tend to hit a wall around third grade.
For reference
Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
See it, then try it
You do not need a lesson plan. Look for these signs in ordinary play, reading, and conversation, then choose one short activity.
Give your child a pile of dry pasta or cereal and a few sandwich bags. Have him count exactly 10 pieces into each bag. Then ask: with 3 bags and 6 loose pieces, what number do we have? Build a few numbers this way, including a teen like 14 (1 bag, 4 loose).
Set out dimes as tens and pennies as ones. Say a number like 52 and have him build it: 5 dimes, 2 pennies. Then reverse it: you set out coins, he names the number. Real money keeps first graders interested longer than any worksheet.
Teen numbers are the sneaky part of this standard, since 'fourteen' hides its ten. Write 11 through 19 on scraps of paper. Pull one, and have your child say it as a ten and ones: 17 is 10 and 7. Do 5 or 6 cards and stop while it is still fun.
Choose what helps today
Start with the domain guide for context, use the learning library when a concept needs explaining, or print a page when your child is ready to practice.
See every 1.NBT skill in order and how the codes fit together.
Open resourceFilter free pages by the exact math skill your child is practicing.
Open resourceExplore number meaning, formation, examples, and printable practice.
Open resourceA short sequence of related early-math pages for repeated practice.
Open resourceParent-friendly ideas for practicing early math in everyday routines.
Open resourceWhy does my child mix up numbers like 14 and 41?
Teen numbers are spoken backwards in English: we say four-teen, with the four first, even though the 1 comes first when we write it. That trips up a lot of first graders and is exactly why this standard singles out 11 through 19. Building teen numbers with objects (one full group of ten, then the extras) usually clears it up faster than correcting the written digits.
Is it bad that my first grader still counts everything one at a time?
Early in the year, no, counting by ones is the base skill. This standard is about outgrowing it. If your child is well into first grade and never groups by tens even with piles of 50 or more, nudge the habit along with the snack bag activity rather than worrying. Grouping usually clicks once kids feel how much faster it is.
Keep the sequence
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