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Subtraction

Level 18 - realistic untimed

3d − 3d (cascade borrow)

6 visual blocks - same-change or add-up

1

Read the shape

Level 18 visual plan for 3d − 3d (cascade borrow)
Look for the distance between the numbers. 3d − 3d (cascade borrow).

Look for the distance between the numbers. 3d − 3d (cascade borrow).

2

Pick the method

Subtraction: block 2 Visual guide level shape 3d − 3d (cascade borrow)Pick the methodMake one number round, or count up. image-first, then practice
Make one number round, or count up.

Make one number round, or count up.

3

First move

Subtraction: block 3 Visual guide level shape 3d − 3d (cascade borrow)First moveChoose the friendly round number. image-first, then practice
Choose the friendly round number.

Choose the friendly round number.

4

Check

Subtraction: block 4 Visual guide level shape 3d − 3d (cascade borrow)CheckAdd the answer back to the lower number. image-first, then practice
Add the answer back to the lower number.

Add the answer back to the lower number.

5

Play the mode

Subtraction: block 5 Visual guide level shape 3d − 3d (cascade borrow)Play the modeSpend the extra second on the check. image-first, then practice
Spend the extra second on the check.

Spend the extra second on the check.

6

Watch-out

Subtraction: block 6 Visual guide level shape 3d − 3d (cascade borrow)Watch-outAvoid borrowing when a cleaner view exists. image-first, then practice
Avoid borrowing when a cleaner view exists.

Avoid borrowing when a cleaner view exists.

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