Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 1K views

    Heuristic Cheat Sheet Clickable Links

    Uploaded by

    emily
    1. The document provides examples of different types of math heuristics problems encountered in PSLE exams, including ratio and proportion, speed, remainders, grouping, overlapping areas, and before/after scenarios. 2. It explains the concepts through worked examples such as finding the time taken for two individuals traveling towards each other to meet based on their speeds, using remainders to solve word problems, and changing values in before/after questions while keeping certain parts the same. 3. The document is intended as a guide for students to understand commonly tested math concepts and problem-solving approaches through over 20 sample questions and detailed explanations.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Heuristic Cheat Sheet Clickable Links

    Uploaded by

    emily
    1K views2 pages
    1. The document provides examples of different types of math heuristics problems encountered in PSLE exams, including ratio and proportion, speed, remainders, grouping, overlapping areas, and before/after scenarios. 2. It explains the concepts through worked examples such as finding the time taken for two individuals traveling towards each other to meet based on their speeds, using remainders to solve word problems, and changing values in before/after questions while keeping certain parts the same. 3. The document is intended as a guide for students to understand commonly tested math concepts and problem-solving approaches through over 20 sample questions and detailed explanations.

    Original Description:

    Original Title

    heuristic cheat sheet clickable links

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    1. The document provides examples of different types of math heuristics problems encountered in PSLE exams, including ratio and proportion, speed, remainders, grouping, overlapping areas, and before/after scenarios. 2. It explains the concepts through worked examples such as finding the time taken for two individuals traveling towards each other to meet based on their speeds, using remainders to solve word problems, and changing values in before/after questions while keeping certain parts the same. 3. The document is intended as a guide for students to understand commonly tested math concepts and problem-solving approaches through over 20 sample questions and detailed explanations.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    1K views2 pages

    Heuristic Cheat Sheet Clickable Links

    Uploaded by

    emily
    1. The document provides examples of different types of math heuristics problems encountered in PSLE exams, including ratio and proportion, speed, remainders, grouping, overlapping areas, and before/after scenarios. 2. It explains the concepts through worked examples such as finding the time taken for two individuals traveling towards each other to meet based on their speeds, using remainders to solve word problems, and changing values in before/after questions while keeping certain parts the same. 3. The document is intended as a guide for students to understand commonly tested math concepts and problem-solving approaches through over 20 sample questions and detailed explanations.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    Ace Scorers – Clickable links PSLE Math Heuristics Problems Sums

    Summary by Mr Teng

    Remainder Concept Repeated Identity Equal Concept

    Ashley had $100. She used up A: B = 1:2 ¼ of A is 2/3 of B. What is the


    $50. What amount is 1/5 of B: C = 3:5 ratio of A to B?
    the remainder? What is A:B:C?
    A
    B is repeated. Make B the
    Ans: same.
    $100 B
    $50 Remainder
    Ans:
    A: B
    B:C
    $10 3: 6 : 10 Ans:
    Make numerator the same
    1/5 of remainder is $10 8: 3
    Supposition Whole part concept Value and Units

    There are 40 cows and ducks A+B =Whole The ratio of $2 and $5 notes is
    in the farm. There are a total A B 2:3. Total value is $38. How
    of 140 legs. How many cows many $2 and $5 notes are
    and ducks are there? 2 Units A = Total - More there?
    A
    =Whole
    Ans: A More Ans:
    Suppose all animals are cows.
    40x 4 = 160 legs 4 Units A = Total - More Value $2 $5
    160 – 140 = 20 =Whole Units 2u: 3u
    20/2 = 10 A VU 4vu 15vu
    A
    There are 10 ducks A
    40 – 10 = 30 A More 1vu -> $38/19vu = $2
    There are 30 cows. 4vu -> $8
    There are 4 x $2 notes.
    15vu -> $30
    There are 6 x $5 notes.
    Before and After Before and After Before and After
    Single Unchanged Total Unchanged Difference Unchanged

    B remains unchanged. Make B B give to A. Total unchanged. Both A and B minus same
    the same. amount. Difference
    A B Total unchanged.
    A B Before 4u 6u 10u
    Before 2u 5u +/- +3u -3u A B Diff
    +/- +3 After 7u 3u 10u Before 4u 6u 2u
    After 3u 5u +/- -3u -3u
    After 1u 3u 2u
    1u -> 3
    Ace Scorers Enrichment Centre 2A Maju Avenue S556680 Serangoon Gardens
    Tel 62894551 www.acescorers.com.sg visit our youtube channel for more videos search for ace
    scorers psle Math or click here Email us at acescorers@gmail.com
    Ace Scorers – Clickable links PSLE Math Heuristics Problems Sums

    Summary by Mr Teng
    Before and After Speed Add Speed Minus
    Units and Parts
    Travelling towards each other. Catching up.
    Both A and B changed. Ali
    Ali 30kmh Baba 40kmh
    40 km 40kmh
    A B Distance 140 km Baba
    Before 2u 5u 50kmh
    +/- +3 -5 Ali and Baba is 140km apart.
    After 7p 5p Ali’s speed is 30km/h and Ali is 40km ahead of Baba. Ali’s
    Baba’s speed is 40km/h and speed is 40km/h and Baba’s
    they are travelling towards speed is 50km/h and they are
    2u + 3 = 7p each other. What time will travelling the same direction.
    5u – 5 = 5p they meet? What time will they meet?

    Make units or parts the same Total speed = 30 + 40 = Difference in speed = 50 - 40 =


    to find u and p. 70km/h 10km/h
    Time taken to meet
    = 140km / 70 = 2 hours. Time taken for Baba to catch
    up and meet = 40km / 10 = 4
    hours.
    DST Ratio Extra short Grouping and sets

    When Ali travel 5km, Baba When Ali give 5 sweets per 5 for $4 6 for $5
    only travel 3km. student, he has 4 short. When
    he give 3 sweets per student, Bought equal number
    of triangles and squares for $245. How
    he has 12 extra. How many many triangles were bought?
    Ali Baba students are there?
    D 5km 3km Ans:
    S 5u 3u Ans: 30 triangles - > $24
    T 3u 5u 5–3=2 30 circles -> $25
    12 + 4 = 16 1 group - > $49
    16 / 2 = 8 students
    $245/$49 = 5 groups
    30 x 5 = 150 triangles
    Circles Circles Overlap Areas
    Find Arrow Head Find Half Leaf
    Always label the different
    Square minus quadrant Quadrant minus triangle parts

    A
    A
    B
    A
    C

    Ace Scorers Enrichment Centre 2A Maju Avenue S556680 Serangoon Gardens


    Tel 62894551 www.acescorers.com.sg visit our youtube channel for more videos search for ace
    scorers psle Math or click here Email us at acescorers@gmail.com

    You might also like