Halves of ‘-ty’ Numbers


The purpose of this activity is to help your child to learn halves of "-ty’ numbers to 100. For example, half of fifty is 25, half of seventy is 35.

Link to Number Framework:

Number Facts, Stage 5

What you need:

  • Game cards (PDF, 28KB). You can print these or make your own. Put a dot on the back of the answer cards so these can easily be matched with the halves facts.

What to do:

Use the doubles and halves cards to play memory. The aim of the game is to find as many matching pairs as possible by remembering where the cards are.

  • Spread out all the cards face down.
  • Turn over 2 cards. If the cards match, for example; "1/2 of 80" and "40" players get to keep the pair. If the cards don’t match, players replace them face down.
  • Take turns to try and find a matching pair.
  • The winner is the player with the most pairs at the end of the game.

Have many pairs can you get?

What to expect your child to do:

Make links between the ‘-ty’ numbers and their corresponding halves, and develop instant recall of this knowledge.

Related Māori vocab:

half haurua
double rearua
matching card kāri taurite

Download a file of this activity:

PDF (94KB) or Word (43KB)

Download a file of this activity including questions to ask in Māori:

PDF (134KB) or Word (58KB)