Math · Stage 1
Estimate and sense-check: how many, how long?
Estimate how many and how long, check the guess, and spot an answer that makes no sense.
✦ Math📘 Stage 1 · S1⏱ ~9 min🧒 Ages 5–6★ Free to start
estimate how many and how long, check the guess, and spot an answer that makes no sense
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The basket at the market
Mei and Wei stand at the market. A big basket of rambutans sits on the table. Wei says, 'There are 90!' Mei looks again and says, 'I think fewer.' They count in tens and find 40. How can a quick look give a good guess before we count? By the end I can make a good guess, count to check it, and say if an answer makes sense.
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What your child will learn
1Warm-up: what do you remember?
2Two new words
3A quick look at a plate
4Guess a jar by chunks of ten
5Nearer 10 or nearer 20 when adding
6Taking away moves left
7Estimate, work out, compare
8Someone says: test it, fix it
9Does the number fit?
10Lengths in big steps
11Beans and a metre of string
12Check your thinking
13My can-do check
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A peek inside
Rina sees a jar of rambutans. One chunk of 10 fills a small part. About how many are there?
Circle one chunk of 10.<br>Three chunks fit, so guess 30.<br>Count them: 34.<br>So 30 is close.
Try this at home: Rina sees a jar of rambutans. One chunk of 10 fills a small part. About how many are there?
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Math · Stage 1 · S1 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.