Model Method - Questions and Answers

Question posted by Tina from Singapore:

Grade/Level: Primary 2

Question: PLEASE TELL ME HOW TO EXPLAIN THIS WORD PROBLEM TO MY PRIMARY TWO DAUGHTER. THIS PROBLEM WAS ON THE E-PORTFOLIO ASK-N-LEARN WEB PAGE OF HER PRIMARY SCHOOL WEBSITE.

QNS) DELVIN AND CHRISTINE COLLECTED 46 SEASHELLS. DELVIN COLLECTED 4 MORE SEASHELLS THAN CHRISTINE. HOW MANY SEA SHELLS DID DELVIN COLLECT?

ANS) THE ANSWER ON THE ASK-N-LEARN E-PORTFOLIO IS DELVIN COLLECTED 25 SEASHELLS.

I DREW THE MODEL FOR THE SUM.

I SOLVED THE SUM USING SIMULTANEOUS EQUATION METHOD.

DELVIN IS X AND CHRISTINE IS Y

x+y=46

(y+4)+y=46

4+2y=46

4+2y=46

2y=46-4

y=42divided by2

y=21

Christine is 21 so delvin is 21+4=25

how can i explain this method to a primary two student. please advise

Answer:

Step 1: Draw 2 identical boxes to show that Delvin and Christine had the same number of seashells.

model-method-questions-and-answers-131

Step 2: Draw an additional box to the right of Delvin's box and label it "4" to show that she had 4 more seashells than Christine.

model-method-questions-and-answers-132


Step 3: Since the total number of seashells they had was 46, draw a bracket to the right to show the total "46". Then draw another bracket on top of Delvin's 2 boxes to show that that was what Delvin collected.

model-method-questions-and-answers-133


From the model,

46 - 4 = 42

42 / 2 = 21

21 + 4 = 25

Thus, Delvin had collected 25 seashells



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