Stærðfræðispæjarar 2
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 2 Skiptu í tugi og einingar. tugir + einingar tugir + einingar 56 = ___________ + ___________ 87 = ___________ ___________ 72 = ___________ + ___________ 94 = ___________ ___________ 39 = ___________ + ___________ 15 = ___________ ___________ 66 = ___________ + ___________ 41 = ___________ ___________ 50 6 Góð regla er að leggja saman einingar fyrst og svo tugi . Leggðu saman. tugir + einingar 29 + 12 = ___________ + ___________ = ___________ 55 + 17 = ___________ + ___________ = ___________ 47 + 48 = ___________ + ___________ = ___________ 26 + 16 = ___________ + ___________ = ___________ 77 + 14 = ___________ + ___________ = ___________ 30 11 10 + 2 20 + 9
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