ALEX Learning Activity


Brain Attack: Adding 10 Mentally Game

A Learning Activity is a strategy a teacher chooses to actively engage students in learning a concept or skill using a digital tool/resource.

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  This learning activity provided by:  
Author: Charissa Smith
System:Alabama Department of Education
School:Alabama Department of Education
  General Activity Information  
Activity ID: 2634
Brain Attack: Adding 10 Mentally Game
Digital Tool/Resource:
10 More Attack
Web Address – URL:

Students will practice adding 10 more mentally using the interactive digital game "10 More Attack."

This activity results from the ALEX Resource Development Summit.

  Associated Standards and Objectives  
Content Standard(s):
MA2019 (2019)
Grade: 1
14. Given a two-digit number, mentally find 10 more or 10 less than the number without having to count, and explain the reasoning used.
Unpacked Content
Evidence Of Student Attainment:
  • Can efficiently find 10 more or 10 less than the given number.
  • Explain their mental strategies.
Teacher Vocabulary:
  • Ten more
  • Ten less
Students know:
  • how to mentally find 10 more or 10 less of a two digit number and explain reasoning.
  • place value vocabulary: tens, ones.
Students are able to:
  • mentally add or subtract 10 from a number in the range from 1-100.
  • Explain their reasoning using place value understanding and patterns.
Students understand that:
  • patterns in the place value system can be used to mentally compute sums and differences.
Diverse Learning Needs:
Essential Skills:
Learning Objectives:
M.1.14.1: Define more and less.
M.1.14.2: Demonstrate conceptual understanding of adding or subtracting 10 using concrete models.
M.1.14.3: Count backward from 100 by tens.
M.1.14.4: Count forward to 100 by tens.
M.1.14.5: Count to 100 by ones.

Prior Knowledge Skills:
  • Define ones and tens.
  • Match the number in the ones and tens position to a pictorial representation or manipulative of the value.
  • Add numbers 1-9 to ten to create teen numbers using manipulatives or place value blocks.
  • Count objects up to 10.
  • Count to 50 and above.
  • Mimic counting by ones.
  • Recognize numbers from 1-50.
  • Understand the concept of amount.
  • Pair the number of objects counted with "how many?"
  • Understand that the last number name tells the number of objects counted.
  • Pair a group of objects with a number representing the total number of objects in the group (up to ten objects).
  • Count objects one-by-one using only one number per object (up to ten objects).
  • Recognize that numbers have meaning.
  • Recognize numbers 1-10.
  • Rote count to 50.
  • Communicate number words.
  • Add one to a set of objects (up to 10 objects).

Alabama Alternate Achievement Standards
AAS Standard:
M.AAS.1.13 Compose and decompose numbers from 1 to 15 into one ten and ones using objects, drawings, or pictures.

Learning Objectives:

Students will mentally add 10 to a given two-digit number.

  Strategies, Preparations and Variations  

Students will use an internet-connected device to play "10 More Attack."

In the game, they will be given a two-digit number and mentally add 10 more to sink the ships. The students' job is to destroy the robot submarines using depth changes. The only problem is the sonar screen is always off by 10 fathoms, so students will have to add ten to the two-digit number shown.

Students will record each equation in their math journals. 

Assessment Strategies:

The teacher will use observation and student recordings to formatively assess students specifically looking for those who are mentally adding 10.

Advanced Preparation:

The teacher needs to provide the link to students.

Students must have an internet-connected device and math journal. 

Variation Tips (optional):
Notes or Recommendations (optional):

ALCOS 2019

14. Given a two-digit number, mentally find 10 more or 10 less than the number without having to count, and explain the reasoning used.

  Keywords and Search Tags  
Keywords and Search Tags: 10 more, add 10, mental addition, twodigit number