Mathematics

Adding two-digit numbers, no carrying

An AR classroom game for Grade 2. Learners can aim with their hands at the camera or play by tapping the screen.

This set has 6 questions in an interactive multiple choice activity.

Curriculum indicatorค 1.1 ป.2/4

Play Host a classroom

A look before you play

Sample questions

A few real prompts from the game to help you choose an activity for your class.

01
23 + 14 = ?
- 37
- 38
- 36
Read the explanation
Add the ones first: three plus four is seven. Then the tens: two plus one is three. That makes thirty-seven.
02
42 + 35 = ?
- 75
- 77
- 87
Read the explanation
Ones: two plus five is seven. Tens: four plus three is seven. That makes seventy-seven.
03
51 + 26 = ?
- 78
- 87
- 77
Read the explanation
Ones: one plus six is seven. Tens: five plus two is seven. That makes seventy-seven.

Before you play

Game teaching guide

What children will practise

Add two two-digit numbers with no carrying, ones with ones and tens with tens, and pick the correct total. This builds towards finding the unknown in addition number sentences (indicator ค 1.1 ป.2/4).

What's in the worksheet

6 multiple-choice questions, 3 options each - 23 + 14 = ? answer 37 - 42 + 35 = ? with options 75, 77, 87 - 60 + 30 = ? both numbers have zero ones, answer 90 - 34 + 45 = ? where 89 and 79 differ only in the tens

How to use it in class

Use as a 5-7 minute warm-up at the start of a lesson, before moving on to carrying. Project it and let pupils answer on tablets, or play in teams of 3-4. - Before revealing each answer, have the class say "ones with ones, tens with tens" - If many miss 34 + 45, set it out in columns on the board and show that the wrong option comes from a slip in the tens, not the ones - Play it linked to the class so the results go into the mark book, and spot who still mixes up place value before carrying starts

Common sticking points

- In 42 + 35, choosing 87 by getting 8 tens instead of 7. Have pupils point to each column and add again - In 60 + 30, choosing 93 by putting the 3 from 30 in the ones place. Read it as "6 tens plus 3 tens" - In 17 + 22, choosing 49 or 38 from a finger-counting slip of one. Always check the ones first