1: number bonds within 10 4 5 4 5 + 0 = 5 4 + 1 = 5 3 + 2 = 5 2 + 3 = 5 1 + 4 = 5 0 + 5 = 5 4 5 8 4 7 5

Using related facts (If _____, what is ____?) 1: number bonds within 10 Using related facts (If _____, what is ____?) If 4 + 3 = 7, what is… 3 + 4 40 + 30 44 + 33 0.3 + 0.4 7 – 3 300 + 400 41 + 30 0.04 + 0.03 7 – 4 700 – 400 77 – 43 0.007 – 0.003 5 + 3 14 + 3 340 + 430 3.4 + 4.3 4 + 4 4 + 53 4,300 + 3,400 0.403 + 0.304 5 + 2 87 – 4 777 – 343 7.77 – 4.43

Using related facts (If _____, what is ____?) 2: number bonds to 10 1 + 9 = 10 2 + 8 = 10 3 + 7 = 10 4 + 6 = 10 5 + 5 = 10 10 4 10 3 Reordering: which numbers would you add together first in these number sentences? Why? Make it clear that there isn’t always an easier order to add number in, but we can look. Use the diagram to complete the number sentences: ___ + ___ = ___ ___ – ___ = ___ Using related facts (If _____, what is ____?) If 6 + 4 = 10, what is… 4 + 6 60 + 40 70 – 4 860 + 40 10 – 6 400 + 600 70 – 6 840 + 60 10 – 4 100 – 40 100 - 4 500 – 40 7 + 4 16 + 4 6 + 3 + 4 0.6 + 0.4 6 + 5 56 + 4 4 + 9 + 6 0.04 + 0.06 7 + 3 6 + 34 60 + 70 + 40 1 – 0.4

3: crossing 10 (+) 6 + 7 = 6 + 4 = 10 10 + 3 = 13

3: crossing 10 (+)

Using related facts (If _____, what is ____?) 3: crossing 10 (+) Using related facts (If _____, what is ____?) If 6 + 8 = 14, what is… 8 + 6 60 + 80 160 + 80 14 – 8 800 + 600 60 + 280 14 – 6 140 – 80 240 – 80 7 + 8 16 + 8 0.6 + 0.8 6 + 9 56 + 8 0.08 + 0.06 7 + 7 6 + 38 1.4 – 0.6

Count on to find the difference Count on to find the difference 4: crossing 10 (-) Count back Count on to find the difference Count on to find the difference

Using related facts (If _____, what is ____?) 4: crossing 10 (-) Using related facts (If _____, what is ____?) If 15 - 7 = 8, what is… 15 - 8 14 – 6 25 - 7 1.5 - 0.7 7 + 8 13 – 5 35 - 7 0.15 - 0.08 8 + 7 12 – 4 75 - 8 2.5 – 0.7 15 - 6 150 - 70 350 – 70 15 – 5 1,500 - 800 550 – 80 14 - 7 7,000 + 8,000 6,500 – 700