Worked Example 1
No New Ten
34 + 5
- 1Add the ones: 4 + 5 = 9
- 2The 3 tens stay the same: 34 + 5 = 39
Answer: 39
Florida Grade 1 Math · Number Sense and Operations
MA.1.NSO.2.4: Adding a Two-Digit and a One-Digit Number
What this Grade 1 benchmark means, worked examples, common mistakes, and a free printable worksheet.
Created by a Florida mom · Published by Tropical Learning LLC
What Is Benchmark MA.1.NSO.2.4?
Children explore adding a two-digit number and a one-digit number, with sums up to 100, using objects, number lines, and drawings.
Sometimes the ones make a new ten. For 47 + 6, the 7 ones and 6 ones make 13 ones, which is 1 ten and 3 ones, so the answer is 53.
Official benchmarkExplore the addition of a two-digit number and a one-digit number with sums to 100.
How it is tested: Grade 1 students take FAST Star Math, Florida's math test for Kindergarten through Grade 2.
Worked Examples
Worked Example 2
Making a New Ten
47 + 6
- 1Break 6 into 3 and 3.
- 247 + 3 = 50
- 350 + 3 = 53
Answer: 53
Common Mistakes to Watch For
Adding the ones to the tens
Wrong:34 + 5 = 84
5 is 5 ones, so add it to the 4 ones: 34 + 5 = 39.
Writing the ones without making a new ten
Wrong:47 + 6 = 413
7 + 6 = 13 ones, which is 1 ten and 3 ones. 4 tens + 1 ten = 5 tens, so the answer is 53.
Helpful Math Tip
Jump on a number line: for 47 + 6, jump to the next ten (50), then jump the rest (3 more to 53).
Related Grade 1 Skills
Make Florida Math Practice More Fun
Help your child build math confidence with original interactive questions aligned with Florida's B.E.S.T. Mathematics Standards.
Start Practicing FreeIndependent Educational Platform. FastChomp is published by Tropical Learning LLC and is not affiliated with, sponsored by, or endorsed by the Florida Department of Education. FAST and Star assessment names are referenced for informational purposes only. FastChomp practice questions are original educational materials, not official Florida FAST assessment questions.