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Grade 2 · Subtraction
Regrouping with Tactile Blocks: 42 − 18 = 24
Step 1 of 6
1. Notice the Quantities on the Bench
42 − 18 = ?Before making any moves, look at the blocks representing 42: 4 ten-rods and 2 single unit cubes. We want to take away 18 (1 ten and 8 ones).
Tens Place (4 Tens = 40)
Need 8 Ones
1 Ten10 Ones
2 ones are not enough to take away 8. Step 2 will unbundle 1 ten!👇 Only 2 Ones
Ones Place (2 Ones = 2)1
1
Predict Before Moving:
When we take 18 away from 42, will the result be MORE than 30 or FEWER than 30?