Many young children experience difficulties in learning subtraction. These difficulties arise early and continue into second grade and beyond, largely because many students fail to move beyond inefficient counting strategies for answering unknown subtraction facts. – Carol A. Thorton and Paula J. Smith
When your child is learning, and perhaps struggling with, subtraction, one way you can help is exploring the concept of subtraction as both “difference” and “take away”. Difference is comparing two sets of similar items (i.e. buttons, cookies or M&M’s). Take away is removing items from a larger set. For example, for seven minus five:
• Is this difference or take away? Your child has picked seven flowers for you. You look next door and see that your neighbor has five flowers. You ask your child, “how many flowers does Mommy or Daddy have, compared to how many flowers our neighbor has?”
• Is this difference or take away? Using cheerios as counters, put out seven cheerios. Let your child eat five before you ask, “how many cheerios are left?”
These three fun math activities let you strengthen your child’s relationship with subtraction while you also bond as a family!
How Close Can You Get?
You need a deck of cards, with the tens, Jacks, Queens and Kings removed. You also need a piece of paper and pencil. Please note that Ace = 1 for this game.
Variations of this math game:
• Players can trade cards.
• Try a 3 digit target number and six cards for each player.
• Playing with younger kids? Try a 1 digit target number and two cards for each player.
• What did you find the most interesting about How Close Can You Get? and why?
• Did you like playing with two or three digit numbers the more? How come?
• How did you keep the different possible combinations straight?
• Can you think of other situations that you’ll need to know subtraction? What are they?
This fast moving game is great for family fun night. Each player needs a sheet of paper, pencil and die.
Variations of this math game:
• Use pairs of different color die One color represents the tens place, the other the ones place. So rolling a 2 and a 3 (per above) would be either a 32 or a 23, depending on the die color.
• For longer rounds, start with larger numbers, such as 999 or 1919.
• For speed rounds, set a kitchen timer for 90 seconds – play Countdown! until time runs out. The winner is the player that gets closest to 0 without making a mistake in his or her subtraction. If mistakes are made, it’s ok (it’s just a game!) but figure out why, as a family.
• For younger players, start at a smaller number (49) and only use one die.
• What was your favorite round and why? (Winning, while great, should not be the only answer!)
• What did you find most challenging about Countdown! and why? Are certain numbers easier to subtract?
• If you could make the rules for the game, what rule would you include or get rid of? Why? How do you think it would change the game?
You will need iOS device, such as an iPad, iPhone or iPod Touch.
Tap the fish icon to create a new player. That way, different kids can compare the colors and fins they’ve won. They can also discuss the different levels of the reef and cave they’ve swum through.
• What are the many ways can you make a difference with two bubbles? For example, what combinations would you feed a fish that eats “9”?
• Can you draw a picture of all of the bubbles you’d want for your fish, if your fish has a 7 on it?
• Did you like the reef or the cave better and why?
We hope you enjoy these subtraction activities with your family. Some, such as Countdown! are perfect for the playroom rug. Other games, such as Motion Math: Hungry Fish, can be played anywhere.
Which these games your family has played and what did you think? If you have other subtraction activities or games you like, please share them in the comments!