Starter quiz
Calculate the missing addend in this bar model.- '680' ✓
- What is the unknown in this problem? Jacob makes a cake using flour, butter and sugar. He uses 500g of flour and 200 g each of butter and sugar.
- The mass of the cake batter. ✓
- The mass of the flour.
- The mass of the butter.
- The mass of the sugar.
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Which equation represents this image?- w + y + ___ = bl ✓
- w + bl + y = ___
- bl + ___ + w = y
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- Which two addends would make the total of 375?
- 420
- 260 ✓
- 115 ✓
- 135
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- Calculate using an efficient strategy. Aisha buys two books. One costs £12.99 and one costs £7.99 What is the total cost of the books? £______
- '20.98' ✓
Complete the column subtraction to find the difference.- '34.56' ✓
Exit quiz
True or false. The missing part can only be found by using a repeated subtraction equation.- True
- False ✓
Which equations represent this bar model?- 36 − 16 − 8 = ? ✓
- 36 - 8 + 16 = ?
- 16 + 8 + ? = 36 ✓
- 16 − 8 + ? = 36
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- Which equations could solve this problem? Jun is making a fruit drink. He has 1.5 l altogether. He has 0.8 l of orange juice and 300 ml of pineapple juice. The rest is water. How much water is needed?
- 1.5 l − 0.8l − ___ = 300 ml
- 1.5 l − 0.8 l − 300 ml = ___ ✓
- 300 ml + 0.8 l + 1.5 l = ___
- 300 ml + 0.8 l + ___ = 1.5 l ✓
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Solve this missing number problem by adding the known parts first. The missing part is ______.- '30' ✓
- Use repeated subtraction. Aisha walks for 90 minutes from home to the local pool. She walks for 35 minutes, rests for 10 minutes then continues. For how much longer does she walk? ______ minutes.
- '45' ✓
- Alex is making a fruit drink. He needs 1.5 l altogether. He pours 0.8 l of orange juice and 300 ml of pineapple juice. The rest of the drink is water. How much water is needed? ______ l
- '0.4 ' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Drawing a model for a simpler problem helps us to solve more complicated problems.
- Known facts can be used to calculate the value of a missing part.
- Mental strategies can be used to calculate the value of a missing part.
Common misconception
Pupils struggle to represent the problem as a repeated subtraction equation.
Simplify problems by using numbers within 10 at first to reveal the structure of the problem. By doing this, you can show how both the subtraction and addition equations relate, which can help you to find the value of the missing parts or whole.
Keywords
Represent - To represent something means to show something in a different way
Addend - Addends are any numbers added together.
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