Add 10 to a numeral
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Add 10 to a numeral: skill guide
| Objective | Learners will be able to add 10 and a number from 1 to 9, in either order, from the numerals alone. |
|---|---|
| Grade | Grade 1 |
| Standard | CCSS.MATH.CONTENT.1.NBT.C.4 |
| Difficulty | Developing · Abstract |
| Representation | 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, from the numerals alone.
What this practice covers
Each problem shows an equation such as 10 + 4 or 4 + 10, with a blank for the total. There is no picture. The learner finds the sum 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 know that teen numbers are one ten and some ones and are ready to add 10 without a picture. 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. Problems show numerals only.
Difficulty and scaffolding
Developing · Abstract stage
Problem representations
- Numerical equation
Three worked examples
- For 10 + 3, one ten and 3 ones make 13.
- For 8 + 10, the order does not change the sum. 8 + 10 is the same as 10 + 8, which is 18.
- For 10 + 5, the ones digit of the sum is the number added to 10, so the sum is 15.
Likely misconceptions
- Learners may count on from 10 one by one and land on the wrong number, or think 8 + 10 and 10 + 8 have different sums. Ask how many tens and how many ones are in the sum before choosing an answer.
Hints and explanations
- For 10 + 3, one ten and 3 ones make 13.
- For 8 + 10, the order does not change the sum. 8 + 10 is the same as 10 + 8, which is 18.
- For 10 + 5, the ones digit of the sum is the number added to 10, so the sum is 15.
What to practice next
Next, Add multiples of 10 adds a number of tens, such as 40, and a number from 1 to 9.
Editorial review
Reviewed by Brilliant’s curriculum team. Exercises are generated within defined difficulty ranges and checked against verified answer rules.
Add 10 to a numeral FAQs
What is the goal of add 10 to a numeral?
The goal is to add 10 and a single digit accurately from the numerals alone. A learner should be able to say that the sum is one ten and that many ones.
Should this practice be timed?
No timer is required. First build accurate, understandable strategies. Speed usually improves as learners notice that the ones digit of the sum matches the number added to 10.
What should a learner do after a mistake?
After a wrong answer, the learner gets a second try. Read the equation aloud, name the ten and the ones, and put them 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.