Step 10: Finding a Part Year 1 Addition and Subtraction Learning Video Clip
Dot and Stan have had a very busy few days trying to put out the volcano and they are ready to go home. Help Dot and Stan on their journey by helping them to find the missing berries, bats, stones and stars in some part-whole model questions.
More resources for Autumn Block 2 Step 10.
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Discussion points for teachers
- Help Stan to work out how many berries there are in the other pile by completing the part-whole model in words. Then complete the number sentences.
Discuss how many berries can be seen in the pile and how many berries there are in total. Discuss how to count on from the given number to reach the total. Which number do we start with when counting on?
4 + 6 = 10; 10 = 4 + 6. There are 6 berries in the other pile.
- Help Stan and Dot to work out how many bats are missing by completing the part-whole model in words.
Discuss how many bats can be seen in each group. Discuss the values which are known in the part-whole model and how to add them together. Discuss counting on from the total of the known values to the given total. Which number do we start with when counting on? Discuss writing the numbers in words.
There is one bat missing.
- Help Dot and Stan work out how many stones have been washed away by completing the part-whole model.
Discuss the totals given on the noticeboards and compare with how many stones are present for each route. Discuss completing the part-whole model for each of the given numbers. Discuss how to count on from the given numbers to the totals.
5 stones have been washed away from route and 4 stones have been washed away from route 2.
- Help Dot and Stan to work out how many stars there could be behind the clouds if there are eight altogether. Show this in a part-whole model and write the calculations to match it.
Discuss how many stars can be seen. Discuss completing the part-whole model with the known numbers. Discuss counting on the total to find the missing value. Which number do we start with when counting on? Discuss different ways in which this missing value could be partitioned.
This question is open-ended for children to explore.
National Curriculum Objectives
Mathematics Year 1: (1C2b) Read, write and interpret mathematical statements involving addition (+), subtraction (–) and equals (=) signs
Mathematics Year 1: (1C2a) Add and subtract one-digit and two-digit numbers to 20, including zero
Mathematics Year 1: (1C4) Solve one-step problems that involve addition and subtraction, using concrete objects and pictorial representations, and missing number problems such as 7=_________ 9
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