Solve the subtraction exercise,
using two jumps on the number line below:
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Solve the subtraction exercise,
using two jumps on the number line below:
To solve the problem using a number line with two jumps, follow these steps:
Therefore, the value of the missing number is .
Add fifty units to the number 31.
What is the resulting number?
The two-jump strategy makes subtraction easier by breaking it into friendly numbers! Jumping to round numbers like 40 first helps you calculate mentally without errors.
Jump to the nearest round number (like 10, 20, 30, 40). From 43, jumping to 40 is easiest because it's only 3 away and creates a simple second jump.
Don't worry! You can still use the strategy. Visualize or draw: Start at 43, jump to 40 (that's 3), then jump from 40 to 17 (that's 23). Add them: .
Yes! You could jump 43 → 30 → 17, which gives jumps of 13 and 13. Adding them: - same answer! The total distance is always the same.
Substitute back into the original equation: . If it's true, you're right! You can also add backwards: ✓
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