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BBC2 J.

Subtracting two-digit numbers - KS1 Maths - Year 2 - BBC

This works if the two numbers are close together. Empty number lines can help you work out the difference between the two numbers.
PBS3 J.

Teaching in Room 9 | Open Number Lines 4 | 2nd Grade Math

Addition & subtraction strategies to solve two-digit equations using an open number line.