B2.2 Recall and demonstrate multiplication facts of 2, 5, and 10, and related division facts.
Activity 1: Multiplication Triplets
Strategy: Commutative Property (Addition or Multiplication)
Materials
- a set of Triplets Cards for Multiplication (Appendices FR17 and 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 Triplets game. Once the cards have been dealt, the students look for the other members of their triplet. They need to know the answer to the question, or consider the possible questions if their card has an answer. For example, triplets could be \(3 \times 2 \), \(2 \times 3\), and 6. When a triplet is complete, all three students sit together. Once all the students are seated, each student trio presents the cards to the class.
Source: translated from Guide d’enseignement efficace des mathématiques de la maternelle à la 6e année, Fascicule 5, 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: translated from Guide d’enseignement efficace des mathématiques de la 1re à la 3e année, Numération et sens du nombre, p. 191.
Activity 3: Hurry to School!
Strategy: Two Facts or Doubles
Materials
- Last One to School! game sheet (FR10);
- 10 counters for each student participating in the game;
- a ten-sided number cube (or a spinner, see FR3).
For this game, students work in pairs. Each student takes 10 counters and places them on their side of the game sheet, one counter per house. When all the counters are placed, the student who starts the game throws the die and says out loud the number that is double the number showing on the die. If the house corresponding to that number has a counter, it is removed and placed in the centre of the game sheet in the "Last One to School!" space. If the student throws the die and gets a number that has already been rolled and the house is empty, they miss a turn. The other student then throws the die, gives double the number that came up, removes the counter from the corresponding house and places it in the centre of the game sheet. The game continues in this manner until one student has removed all of their counters from the houses and sent all the children to school.
Source: translated from Guide d’enseignement efficace des mathématiques de la maternelle à la 6e année, Fascicule 5, p. 75-76.