Made with the help of AI from public curriculum standards, then checked. Mistakes can slip through, so please look it over before use. Found one? Tell us and we will fix it.
What's on the worksheet
Fill in the missing numbers on this part of the hundred chart.
Write 10 less and 10 more.
Add the tens to make 100.
Count by 10s, starting at 7. ★
Skills practiced
This 100th day page uses the number 100 to practice the place value ideas first graders work on all year. Your child fills gaps in the last rows of a hundred chart, finds 10 less and 10 more than a number, adds tens to make exactly 100, and counts by tens from 7. Seeing that 10 more than 46 is 56, without counting each step, shows real understanding of tens and ones, and the hundred chart makes the pattern easy to see: moving down a row adds ten.
Your child reads the instruction out loud and explains in their own words what to do.
Work through the tasks in order: the first ones are easier and warm up for the next.
The task with a star is optional, for early finishers.
Check together with the answer key and redo only what was wrong.
Tips for parents and teachers
Before starting, ask your child what changes and what stays the same when you add 10 to 46. Usually children notice that the ones digit stays and the tens digit goes up by one; that observation is the key to the whole page. In the 10 more column, watch 90: 10 more is 100, a new kind of number with three digits. Let your child check answers on a full hundred chart.
Make it easier or harder
Easier: Give your child a complete hundred chart to use as a guide, and do the table with 10 more and 10 less using bundles of ten sticks.
Harder: Ask your child to count by 10s backward from 97 to 7, or to find all the pairs of tens that make 100, such as 30 + 70.
Answer key
Show the answer key
Answer Key: 100th Day of School Math
1st Grade · Math
CCSS 1.NBT.C.5, CCSS 1.NBT.C.4 · ★★ Medium
cozyworksheets
1Fill in the missing numbers on this part of the hundred chart.
It is made for 1st Grade (ages 6-7). The level is ★★ medium, so it suits children who already know the basics.
How long does it take?
About 25 minutes, about the length of a short homework task or a warm-up at the start of a lesson.
Where is the answer key?
On the second page of the PDF and on this page under Show the answer key. To print for a whole class, print only the first page of the PDF.
Which standard does it practice?
Common Core 1.NBT.C.5 (jumping up or down by ten from any 2-digit number mentally); Common Core 1.NBT.C.4 (adding sums up to 100 by grouping tens first, then single units); Common Core 1.NBT.A.1 (counting, reading, and writing numbers up to 120 from any starting point).
Can I use it in my classroom?
Yes. Print as many copies as you need for your own children or students. Please do not resell it or upload it to other websites.
Need a fresh version?The worksheet maker builds new pages with different numbers, mazes and tracing rows, plus versions A, B and C for a class.Open the worksheet maker
