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32) Missing Number Equations

Bonds of 10: Fill a Row

32.1 Missing Number Equations Fill A Row

Mathematics

Develop fluency using two-part bonds of 10 in related addition or subtraction equation where the unknown is a missing part.

Language

  • addition as ‘add’. Read aloud as “(Part) add (part) equals 10”.
  • subtraction as ‘subtract’. Read aloud as “(Whole) subtract (part) equals (part)”.
  • equals
  • part-part-whole
  • Subtraction solved using adding on. For example, 10 – ? = 3 can be thought of as “What part joins (adds on) to 3 to make the whole of 10?”
  • The activity board uses the word “missing”. The word “unknown” is introduced when the Missing Number Sorting Cards are used.

Please, click this link to read Teacher Notes for information about “Solving Missing Number Equations” using part-part-whole.

Differentiation

A little easier

Skill Focus: addition

Play using the first column on each player’s game board. The player who fills the most missing numbers in 3 minutes wins. This is helpful for students who need to focus on repeating the same type of question to develop fluency.

Repeat using the second column of addition. Each column has the missing number in a different position.

Skill Focus: subtraction

Play using the fourth column on each player’s game board. This column of subtraction has the unknown in the typical position. The player who fills the most missing numbers in 3 minutes wins. This is helpful for students who need to focus on repeating the same type of question to develop fluency.

Repeat using the third column on each player’s game board. This column of subtraction has the unknown part in an atypical position.

Working Memory Support: build a wall
  • Build a two-part bond wall of 10. Use one of each block from 1 to 10 and one additional 5 block. Place this next to each related row on the activity board. 
  • Use the blocks to solve each missing number in the first row. Write each missing number on the write and wipe sleeve with a dry erase marker. 
  • Repeat for each row.
  • Discuss patterns. For example, each row uses the same two-part bond of 10. 

A little harder

Missing number equations tic-tac-toe

Play Bonds of 10: Missing Number Equations Tic-Tac-Toe a little harder. This game board is harder in two ways when compared to the core game board:

  • The missing number equations aren’t grouped in related bonds but instead are placed randomly on the board.
  • It includes subtraction equations where the missing number is in the whole position.  
  • Support students who are having difficulty by identifying the subtraction equations on the game board where the whole is the unknown. Place the game board in a write and wipe sleeve and circle these equations. Then play.

Progression

In the next activity students apply the skills of representing of Bonds of 10 with Bond Blocks and as addition and subtraction equations to create related number stories using words and pictures. Go to

Activity 33

Bonds of 10: Representing Addition, Thinkboard

Bonds of 10: Representing Subtraction, Thinkboard