lesson
Ten or one hundred more
1 · Learn
Adding ten changes the value by one ten, even when you cross a hundred. 295 + 10 = 305, not 205.
Adding one hundred changes the value by one hundred. You can use place-value equipment to exchange ten tens for one hundred when needed.
2 · Worked example
For 604 − 10, I exchange one hundred into ten tens. Removing one ten leaves 594.
3 · Your turn
Find ten more than 398 and one hundred less than 705.
Check your answer
408 and 605.
4 · Apply your learning
Draw jumps of ten and one hundred from different three-digit starting numbers. Check the direction before calculating.
Adult guidance and safety
Use objects or a drawn model before relying on a rule. Explain each step, check the units and revisit with varied examples. An adult can read the instructions without supplying the answer.
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