Content Focus: Addition
Learning Intention:
Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers and make estimates for these computations
Learning Intention:
Select and apply efficient mental and written strategies and appropriate digital technologies to solve problems involving all four operations with whole numbers and make estimates for these computations
Easy
We say, ‘9 ones plus 5 ones is 14 ones’.
14 ones is the same as 1 ten and 4 ones. Write 4 in the ones column and carry 1 ten into the tens column. Game
Addition Flip Shuffle the deck of cards. Deal the entire deck out evenly between two students. Both students flip over a card at the same time, the first player to say the sum of the two cards aloud wins the two cards. The first child to accumulate all of the cards is the winner. |
As a procedure, the standard algorithm for addition works in the following steps.
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Task:
Difficult
What is the combined age of every student in the class? Add the ages together in your head. Calculate to see how accurate you are.
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When implementing the algorithm to add two numbers, the most complicated process we face when adding a column of digits is the sum of two single-digit numbers. When we use the algorithm to add more than two numbers, we may have to use mental arithmetic to add a single-digit number to a two-digit number.
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Task:
Games
Reach 100
1. Place a shuffled deck of cards, face down, in the centre of the playing area.
2. Each player begins by drawing one card and placing it face up in front of themselves. Players write the value of this card down at the top of their papers. (Aces are worth 1, and face cards are all 10.)
3. When all players are ready, everyone draws a second card. They add the value of these cards to their totals.
4. Keep playing until one player reaches 100.
Adaptation/Variation/Extension:
Play until the deck runs out. The player closest to 100, without going over, wins.
1. Place a shuffled deck of cards, face down, in the centre of the playing area.
2. Each player begins by drawing one card and placing it face up in front of themselves. Players write the value of this card down at the top of their papers. (Aces are worth 1, and face cards are all 10.)
3. When all players are ready, everyone draws a second card. They add the value of these cards to their totals.
4. Keep playing until one player reaches 100.
Adaptation/Variation/Extension:
Play until the deck runs out. The player closest to 100, without going over, wins.
- Add jokers into the deck. If a player draws a joker, their score drops back to zero.
- Start with 100 points, and subtract your way to the finish.
- Challenge- Use multiplication to reach 1000.
Die Add
Adaptation/Variation/Extension:
- Each player in turn rolls all three of the dice. After the first throw, remove the die with the highest number and put it aside. Roll the two remaining dice and again put the highest number aside. Roll the last die and add up the numbers on all three dice to get the player’s score for that round.
- Record the score on paper.
- Continue taking turns moving clockwise around the table until all players have had a turn. The highest score for the round wins.
- Play a number of rounds add up a combined score at the end or tally winning rounds to come up with a game champion.
Adaptation/Variation/Extension:
- Play with two dice for weaker children to learn addition skills.
- Keep the lowest numbered die rather than highest for a slightly easier game that teaches addition skills.
- Increase the number of dice in the game to 4+ to learn more complicated addition skills.