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Four operations

Multiplying and dividing by 10, 100, 1000 and their multiples, the order of operations, and word problems with whole numbers.

8 topics51 episodes22 min in all

Play from the start

Contents

  1. 1 Multiplying by 10, 100 and 1000 5 episodes · 3 min

    Multiplying whole numbers by 10, 100 and 1000 by moving the digits. Topic page ›

    1. 1.1 Multiply by 10 0:28
    2. 1.2 Multiply by 100 0:30
    3. 1.3 Multiply by 1000 0:38
    4. 1.4 A table of × 10, × 100 and × 1000 0:23
    5. 1.5 Ten times and a hundred times as many 0:37
  2. 2 Multiplying by tens, hundreds and thousands 5 episodes · 2 min

    Multiplying by numbers such as 30, 400 and 2000, with an estimate first. Topic page ›

    1. 2.1 Estimate, then multiply by tens 0:28
    2. 2.2 Estimate, then multiply by hundreds 0:29
    3. 2.3 Estimate, then multiply by thousands 0:31
    4. 2.4 Tick the same products 0:21
    5. 2.5 Tick the same products, three or four numbers 0:22
  3. 3 Dividing by 10, 100 and 1000 5 episodes · 3 min

    Dividing whole numbers by 10, 100 and 1000 by moving the digits. Topic page ›

    1. 3.1 Divide by 10 0:26
    2. 3.2 Divide by 100 0:30
    3. 3.3 Divide by 1000 0:32
    4. 3.4 The missing number in a division 0:34
    5. 3.5 Ten times as much, so divide 0:39
  4. 4 Dividing by tens, hundreds and thousands 5 episodes · 2 min

    Dividing by numbers such as 30, 400 and 2000, with an estimate first. Topic page ›

    1. 4.1 Estimate, then divide by tens 0:26
    2. 4.2 Estimate, then divide by hundreds 0:29
    3. 4.3 Estimate, then divide by thousands 0:32
    4. 4.4 Tick the same answers when dividing 0:23
    5. 4.5 Tick the same answers, bigger numbers 0:21
  5. 5 Order of operations without use of brackets 5 episodes · 2 min

    Which step comes first when a calculation mixes adding, subtracting, multiplying and dividing. Topic page ›

    1. 5.1 Add and subtract from left to right 0:27
    2. 5.2 Multiply and divide from left to right 0:27
    3. 5.3 Which working is correct? (a) 0:32
    4. 5.4 Which working is correct? (b) 0:32
    5. 5.5 Multiply and divide before you add and subtract 0:28
  6. 6 Order of operations with use of brackets 3 episodes · 2 min

    Working out the part in brackets first, then the rest in the right order. Topic page ›

    1. 6.1 Which working is correct? Brackets (a) 0:37
    2. 6.2 Which working is correct? Brackets (b) 0:37
    3. 6.3 Brackets first 0:40
  7. 7 Word problems 20 episodes · 7 min

    Word problems with whole numbers that take two or more steps: money, sharing, ages and more. Topic page ›

    1. 7.1 Money used in one year 0:24
    2. 7.2 Monthly payments for a sewing machine 0:23
    3. 7.3 Colouring books shared among kindergartens 0:24
    4. 7.4 Lemonade in 70 ml cups 0:24
    5. 7.5 Printers and projectors for a school 0:17
    6. 7.6 Books on two shelves made equal 0:18
    7. 7.7 Marbles not used 0:19
    8. 7.8 Lamps or cushions for the same money 0:20
    9. 7.9 Prize money for three girls 0:18
    10. 7.10 When will their ages add up to 61? 0:20
    11. 7.11 When will Aunt Suda be 5 times as old as Fah? 0:20
    12. 7.12 The same money at first 0:22
    13. 7.13 The price of a kettle 0:19
    14. 7.14 A basket of potatoes and a basket of onions 0:21
    15. 7.15 Beads after a gift 0:20
    16. 7.16 Pages read on the last day 0:20
    17. 7.17 The price of a scarf 0:19
    18. 7.18 Hair clips on cards 0:24
    19. 7.19 Gifts from their father 0:19
    20. 7.20 The total of the even numbers to 78 0:17
  8. 8 Thinking questions 3 episodes · 1 min

    Puzzles with number cards, with coins, and with multiplying by 99 when the 9 key is broken. Topic page ›

    1. 8.1 Number sentences from cards 0:30
    2. 8.2 Ten-cent and fifty-cent coins 0:20
    3. 8.3 Multiply by 99 with a broken 9 key 0:27