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        • Mathemateg

         

        Addition and Subtraction...
        Beth wyt ti'n meddwl?
        What strategies have we been exploring?
        Talk to your partner, quick re-cap time!
        I wonder, can you spot the mistake?
        Talk to your partner.

         

        Let's try an ACE scenario together.
        145 pupils are going on a school trip.
        1 adult per 10 pupils
        Each bus holds 40 people
        Each pupil needs:
        • 2 lunch bags
        • 2 water bottles
        • 3 activity sheets
        Each adult needs:
        • 2 lunch bags
        • 2 emergency contact sheets

         

         

        How many people are going on the trip altogether?
        How many lunch bags are needed for pupils?
        For adults, how many water bottles and activity sheets are needed?
        How many emergency contact sheets are needed?
         

        Analyse

        Step 1:
        Total people
        145 pupils + 15 adults = 160 people
        Step 2:
        Total items for pupils
        • Lunch bags: 145 × 2 = 290
        • Water bottles: 145 × 2 = 290
        • Activity sheets: 145 × 3 = 435
        Step 3:
        Total items for adults
        • Lunch bags: 15 × 2 = 30
        • Emergency contact sheets: 15 × 2 = 30
        Step 4: Grand totals
        • Lunch bags: 290 + 30 = 320
        • Water bottles: 290
        • Activity sheets: 435
        • Emergency contact sheets: 30

         

         

        Create

        Step 5: Buses needed
        160 ÷ 40 = 4 buses

        Step 6: Organise items
        You could use a table or diagram to show:

         

        Evaluate

        Reflection Questions:
        • Did you need to carry or exchange when calculating?
          → Yes, especially when multiplying 145 × 3 for activity sheets.
        • How did you check your answers?
          → I used estimation and repeated addition to verify.
        • What would happen if 10 more pupils joined the trip?
          → New pupil count: 155
          → Adults needed: 155 ÷ 10 = 15.5 → round up to 16 adults
          → New total people: 155 + 16 = 171
          → Buses needed: 171 ÷ 40 = 4.275 → round up to 5 buses

         

        Now you try your own scenarios. Remember to Analyse, Create and Evaluate. Use the sentence starters below to help you explain your answers. 

         

         

        Analyse

        • “I know that there are ___ pupils and ___ adults because…”
        • “Each person needs ___, so I need to multiply…”
        • “To find the total number of items, I will…”
        • “I noticed that the number of ___ is more than ___ because…”
        • “This reminds me of when we did ___ because…”

        Create

        • “I started by calculating…”
        • “I chose this strategy because…”
        • “I used a table/diagram to show…”
        • “I organised my working by…”
        • “I created my own version with ___ pupils and ___ adults.”
        • “To solve this, I used the number sentence…”

        Evaluate

        • “I checked my answer by…”
        • “I had to carry/exchange when I added/subtracted ___.”
        • “I can prove my answer is correct because…”
        • “If the number of pupils changed to ___, then…”
        • “I could show this another way by…”
        • “The most challenging part was…”
        • “I noticed a pattern when…”
        • “Next time, I would…”

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