Two-Digit Addition Within 100
- Qs
- 6
- Marks
- 6
NameDateScore / 6
1.[1]
6 + 3 =
2.[1]
2 + 7 =
3.[1]
3 + 2 =
4.[1]
5 + 5 =
5.[1]
5 + 4 =
6.[1]
5 + 4 =
Answer key
- 96 + 3 = 9
- 92 + 7 = 9
- 53 + 2 = 5
- 105 + 5 = 10
- 95 + 4 = 9
- 95 + 4 = 9
Two-Digit Addition Within 100: Grade 1 math
This topic builds mental and informal written addition strategies for two-digit numbers with and without bridging ten. Pupils practise number line jumps, partitioning tens and ones, and consolidating basic two-digit sum fluency.
What this covers
Two-Digit Addition Within 100 is taught in Grade 1 (age 6 to 7) as a topic to introduce. It sits in the Number strand.
Worked example
Calculate: 38 + 25
- Partition 25 into 20 and 5.
- Add the tens: 38 + 20 = 58.
- Add the ones: 58 + 5 = 63.
Answer: 63
Difficulty scale
The sheet generator offers five difficulty settings for this topic.
- Adding a 1-digit number to a 2-digit number without bridging ten (e.g., 23 + 4)
- Adding a 1-digit number to a 2-digit number with bridging ten (e.g., 28 + 6)
- Adding a multiple of 10 to a 2-digit number (e.g., 45 + 30)
- Adding two 2-digit numbers without regrouping (e.g., 42 + 35)
- Adding two 2-digit numbers with regrouping across ten (e.g., 47 + 38)
Common mistakes
- Adding tens to ones by concatenating digits without place value alignment
- Forgetting to add the bridged ten when sum of ones exceeds 9
Curriculum links
Indicative matches to Common Core State Standards. Check wording and codes against the official document.
- 1.NBT.C.4 Add within 100, including adding a two-digit number and a one-digit number or a multiple of 10.
Sample sheet and answers
Six questions at the level's usual difficulty. Open the editor to change, add or regenerate any of them.