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Addition and Subtraction
Objectives
To use pairs to 10 to find amount to next 10.
Resources
Abacus Workbook 2 | 100 bead string | Two 1-10 dice | Mini whiteboard and pen
Vocabulary
ten(s) | multiple(s) of 10 | one(s)
Today's Lesson
Introduction
Show your student 7 beads at the start of the 100 bead string.
Ask, ‘How many more do we need to make 10?’ (Answer: 3)
Show 17 beads. Ask, ‘How many more to make 20?’ (Answer: 3)
Point out the pair to 10, the 7 and 3.
Then show 27 beads.
Ask, ‘What is the next multiple of 10 after 27? How many more to make 30?’
Encourage your student to look at the pair to 10 to help them work this out.
This video demonstrates using the beaded line to use knowledge of pairs to 10.
Repeat with 37, 47, 57… 97.
Record the matching number sentences on a mini whiteboard.
For example: 47 + 3 = 50.
Ask your student to show 15 on the bead string. Ask, ‘What’s the next multiple of 10? What number sentence can we write?’
Repeat with 25, 35, 55, 75 and 95.
Repeat with 26, 46, 86 and 96.
Main Activity
Ask your student to roll two 1-10 dice to make a 2-digit number. If they roll 10, they roll again.
For example, if they roll a 3 and a 5, they can make 53 or 35.
Next, they make their chosen number on their bead string. Then they should look at the bead string to see what needs to be added to make the next multiple of 10.
They can then record the number sentence, for example: 53 + 7 = 60.
Workbook
To help your student consolidate their learning from today, please ask them to complete the activities on page 13 of Abacus Workbook 2.