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Add 10: skill guide
| Objective | Learners will be able to add 10 and a number from 1 to 9, in either order, and name the sum as one ten and some ones. |
|---|---|
| Grade | Grade 1 |
| Standard | CCSS.MATH.CONTENT.1.NBT.C.4 |
| Difficulty | Developing · Mixed |
| Representation | Ten strip, Numerical equation |
| Practice format | Interactive, account-free practice with immediate feedback |
Objective
Learners will be able to add 10 and a number from 1 to 9, in either order, and name the sum as one ten and some ones.
What this practice covers
Each problem shows ten strips and an equation such as 10 + 6 or 6 + 10. The dots for the two numbers appear in two colors. Together they fill one strip, with the rest of the dots in the next strip. The learner finds the total and taps it from five choices. The other number is from 1 to 9, so sums run from 11 to 19. The 10 comes first in some problems and second in others.
Standards alignment
Supports Common Core: CCSS.MATH.CONTENT.1.NBT.C.4 — Add within 100, including adding a one-digit number and a multiple of 10.
Who it’s for
This practice is for Grade 1 learners who can count to 20 and are starting to see teen numbers as one ten and some ones. It also suits older learners who still count on from 10 one by one.
What to know first
- Learners should count reliably, read two-digit numerals, and understand addition as joining parts. Each problem shows the sum on ten strips.
Difficulty and scaffolding
Developing · Mixed stage
Problem representations
- Ten strip
- Numerical equation
Three worked examples
- For 10 + 4, one strip is full and the next strip has 4 dots. One ten and 4 ones make 14.
- For 7 + 10, the dots still fill one strip, with 7 more in the next strip. The order does not change the total, so 7 + 10 = 17.
- For 10 + 9, one full strip and 9 more dots make 19.
Likely misconceptions
- Learners may count every dot from one before they see a full strip as 10. Some think 7 + 10 and 10 + 7 have different totals. Name the full strip as ten, count the dots in the next strip, and put the two together.
Hints and explanations
- For 10 + 4, one strip is full and the next strip has 4 dots. One ten and 4 ones make 14.
- For 7 + 10, the dots still fill one strip, with 7 more in the next strip. The order does not change the total, so 7 + 10 = 17.
- For 10 + 9, one full strip and 9 more dots make 19.
What to practice next
Next, Add 10 to a numeral asks for the same kind of sums with numerals only and no ten strips.
Editorial review
Reviewed by Brilliant’s curriculum team. Exercises are generated within defined difficulty ranges and checked against verified answer rules.
Add 10 FAQs
What is the goal of add 10?
The goal is to see that 10 plus a number from 1 to 9 makes one ten and that many ones. A learner should be able to point to the full strip, call it 10, and find the total without counting every dot.
Should this practice be timed?
No timer is required. First build accurate, understandable strategies. Speed usually improves as learners see the full strip as 10 and notice that the ones digit of the sum matches the other number.
What should a learner do after a mistake?
After a wrong answer, the learner gets a second try. Point to the full strip and say 10, then count the dots in the next strip and put the two together. A short explanation helps more than a quick second guess.
How many problems should be completed at once?
A Quick check has 5 problems and a Practice session has 15. A learner may pause when attention drops. A short, successful session with clear reasoning is more useful than rushing through a longer one.