___________
Maths
Column subtraction
Starter quiz
Try it
Give to class
Which number represents the whole in this bar model?
15
41
51 ✓
501
Subtract 20 from the number represented by the base ten blocks. What answer do you get?
'31' ✓
Which number represents the whole in this equation? 25 − 12 = 13
25 ✓
12
13
Which number represents the whole in this equation? 20 = 42 − 22
'42' ✓
What is 87 − 40 =
______
'47' ✓
Match up the parts to the correct whole, using the bar model to help you.
54 − 22 =
⇔
32 ✓
54 − 32 =
⇔
22 ✓
32 + 22 =
⇔
54 ✓
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