1st Grade Adding and Subtracting Tens Within 100 Test Solutions and Scoring (PDF)
This adding tens test answers for 1st Grade covers adding and subtracting tens within 100 (Common Core 1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6), with a free PDF to print.
Grade 1 · Common Core State Standards: 1.NBT.C.4, 1.NBT.C.5, 1.NBT.C.6
Adding tens test answers: worked solutions
Question 1 – Tens and ones [2 pts]
- 56: 5 tens and 6 ones.
- 66: 6 tens and 6 ones.
Scoring: 1 point for each correct number.
Question 2 – Mystery numbers [2 pts]
- 73: 83 – 10 = 73.
- 51: 61 – 10 = 51.
Scoring: 1 point for each correct number.
Question 3 – Add [3 pts]
- 67
- 75: 4 tens + 3 tens = 7 tens, and 5 ones.
- 44: 38 + 2 = 40, then 40 + 4 = 44.
Scoring: 1 point for each correct sum.
Question 4 – Subtract tens [3 pts]
- 40: 9 tens – 5 tens = 4 tens.
- 50: 7 tens – 2 tens = 5 tens.
- 0: 8 tens – 8 tens = 0.
Scoring: 1 point for each correct difference.
Question 5 – Number line [2 pts]
- 50: 47 + 3 = 50.
- 52: 50 + 2 = 52.
Scoring: 1 point for 50, 1 point for 52.
Question 6 – Missing number [3 pts]
- 30: 5 tens + 3 tens = 8 tens.
- 50: 5 tens + 4 tens = 9 tens.
- 50: 7 tens – 5 tens = 2 tens.
Scoring: 1 point for each correct number.
Question 7 – Tickets at the fair [3 pts]
- \(24 + 30 = 54\)
- 54 tickets: 2 tens + 3 tens = 5 tens, and 4 ones.
- 40 tickets: 30 + 10 = 40.
Scoring: 1 point for the equation, 1 point for 54, 1 point for 40.
Question 8 – Hundred chart [2 pts]
- 48: one row up.
- 68: one row down.
Scoring: 1 point for each correct number.
Total score
20 points
Key facts behind this adding tens test answers
- A two-digit number has tens and ones, like 34 = 3 tens and 4 ones.
- To add ones, keep the tens and add the ones.
- If the ones pass 9, make the next ten first.
- 10 more or 10 less changes only the tens digit.
- To subtract tens, think of tens: 8 tens – 3 tens = 5 tens.
How to use this adding tens test answers
Score your test with the point values shown for each question. Then read the worked solution of every question where you lost points and note the method to review.
All Grade 1 chapters: Grade 1 math.
