Test solutions with the detailed point scale. Add up your points and spot what to review.
1 Quick calculations / 4 pts
- \(52 + 36 = 88\) (1 pt)
- \(47 + 28 = 75\) because \(7 + 8 = 15\) and \(4 + 2 + 1 = 7\) tens (1 pt)
- \(79 - 35 = 44\) (1 pt)
- \(83 - 46 = 37\) because \(13 - 6 = 7\) and \(7 - 4 = 3\) tens (1 pt)
2 Place value / 3 pts
- \(14\) ones is \(1\) ten and \(4\) ones, so we have \(6\) tens and \(4\) ones: \(64\). (1 pt)
- Tens: \(20 + 30 = 50\) (1 pt). Ones: \(9 + 4 = 13\). Total: \(50 + 13 = 63\) (1 pt).
3 Open number line / 3 pts
Start at \(68\) (1 pt). Jump \(20\) to \(88\) (1 pt). Jump \(5\) to \(93\). So \(68 + 25 = 93\) (1 pt).
4 Several numbers / 4 pts
- \(21 + 16 = 37\), \(37 + 34 = 71\), \(71 + 19 = 90\) (2 pts)
- \(13 + 27 = 40\), \(40 + 45 = 85\), \(85 + 8 = 93\) (2 pts)
5 Check the answer / 3 pts
Check: \(55 + 29 = 84\) (1 pt). This is not \(74\), so Kai is wrong (1 pt). The correct answer is \(74 - 29 = 45\), since \(45 + 29 = 74\) (1 pt).
6 Farm problem / 3 pts
Birds at first: \(46 + 38 = 84\) (1 pt). Birds left: \(84 - 29 = 55\) (1 pt). There are \(55\) birds left (1 pt).
Test yourself: quick challenge for Grade 2
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