B2.2 Recall and demonstrate multiplication facts of 2, 5, and 10, and related division facts.
Activity 1: Multiplication Trios
Strategy: Commutative Property (Addition or Multiplication)
Materials
- a set of Trios Cards for Multiplication (FR17and FR18)
- take only sets that are multiplication facts of 2 and 5 or create your own trio cards (for example, \(2 \times 4\), \(4 \times 2\), 8; \(3 \times 10\), \(10 \times 3\), \(30\);\(5 \times 6\), \(6 \times 5\), \(30\); …)
This activity is done with the whole class. Each student receives a card from the Trios game. Once the cards have been dealt, the students look for the other members of their trio. They need to know the answer to the question, or consider the possible questions if their card has an answer. For example, trios could be \(3 \times 2 \), \(2 \times 3\), and 6. When a trio is complete, all 3 students sit together. Once all the students are seated, each trio presents the cards to the class.
Source : Guide d’enseignement efficace des mathématiques de la maternelle à la 6e année, p. 78.
Activity 2: Graphs and Multiplication
Over the course of the year, create pictographs with a many-to-one correspondence (for example, 1 picture corresponds to 5 students).
Discuss the fact that the graph requires the use of multiplication (for example, if 1 picture represents 5 students, 3 pictures represent (3 times 5) or 15 students).
Provide an opportunity for students to collect data and construct numerous graphs representing a many-to-one correspondence.
Ask them to write and answer questions about the interpretation of a graph based on the data.
Source : Guide d’enseignement efficace des mathématiques de la 1re à la 3e année, p. 191.
Activity 3: Hurry to School!
Strategy: Two Facts or Doubles
Materials
- Hurry to School! game sheet (FR10);
- 10 tokens for each student participating in the game;
- a ten-sided numbered die (or a spinner, see FR3).
For this game, students work in pairs. Each student takes 10 tokens and places them on their side of the game sheet, one token per house. When all the tokens are placed, the student who starts the game throws the die and says out loud the number that is double the number on the die. If the house corresponding to that number has a token, the token is removed and placed in the centre of the game sheet in the "Hurry to School!" space. If the student throws the die and gets a number that has already appeared and the house is empty, they must wait until the next turn to try again. The next student to play throws the die, gives double the number that came up, removes the token from the corresponding house and places it in the centre of the game sheet. The game continues in this manner until a student has removed all of their tokens from the houses and sent the children to school.
Source : Guide d’enseignement efficace des mathématiques de la maternelle à la 6e année, p. 75-76.